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Finding the Fourth Proportional to 642,603.70, 963,905.55 and 193,393.90

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Solution

The fourth proportional to 642,603.70, 963,905.55 and 193,393.90 is: 290,090.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,603.70 : 963,905.55 = 193,393.90 : x
  2. Step 2: Convert to fraction form
    642,603.70/963,905.55 = 193,393.90/x
  3. Step 3: Cross multiply
    642,603.70x = 963,905.55 × 193,393.90
  4. Step 4: Simplify right side
    642,603.70x = 186,413,453,546.15
  5. Step 5: Solve for x
    x = 186,413,453,546.15/642,603.70
  6. Step 6: Final answer
    x = 290,090.85

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Double scale
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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.