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Finding the Fourth Proportional to 643,820.70, 965,731.05 and 194,610.90

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Solution

The fourth proportional to 643,820.70, 965,731.05 and 194,610.90 is: 291,916.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,820.70 : 965,731.05 = 194,610.90 : x
  2. Step 2: Convert to fraction form
    643,820.70/965,731.05 = 194,610.90/x
  3. Step 3: Cross multiply
    643,820.70x = 965,731.05 × 194,610.90
  4. Step 4: Simplify right side
    643,820.70x = 187,941,788,798.45
  5. Step 5: Solve for x
    x = 187,941,788,798.45/643,820.70
  6. Step 6: Final answer
    x = 291,916.35

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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.