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Finding the Fourth Proportional to 642,406.70, 963,610.05 and 199,117.10

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Solution

The fourth proportional to 642,406.70, 963,610.05 and 199,117.10 is: 298,675.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,406.70 : 963,610.05 = 199,117.10 : x
  2. Step 2: Convert to fraction form
    642,406.70/963,610.05 = 199,117.10/x
  3. Step 3: Cross multiply
    642,406.70x = 963,610.05 × 199,117.10
  4. Step 4: Simplify right side
    642,406.70x = 191,871,238,686.86
  5. Step 5: Solve for x
    x = 191,871,238,686.86/642,406.70
  6. Step 6: Final answer
    x = 298,675.65

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Half scale
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Double scale
Find fourth proportional to 642,407.70, 963,611.55 and 199,118.10
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.