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Finding the Fourth Proportional to 638,139.20, 957,208.80 and 616,487.90

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Solution

The fourth proportional to 638,139.20, 957,208.80 and 616,487.90 is: 924,731.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,139.20 : 957,208.80 = 616,487.90 : x
  2. Step 2: Convert to fraction form
    638,139.20/957,208.80 = 616,487.90/x
  3. Step 3: Cross multiply
    638,139.20x = 957,208.80 × 616,487.90
  4. Step 4: Simplify right side
    638,139.20x = 590,107,642,973.52
  5. Step 5: Solve for x
    x = 590,107,642,973.52/638,139.20
  6. Step 6: Final answer
    x = 924,731.85

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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.