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Finding the Fourth Proportional to 498,494.28, 687,918.60 and 272,139.78

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Solution

The fourth proportional to 498,494.28, 687,918.60 and 272,139.78 is: 375,550.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    498,494.28 : 687,918.60 = 272,139.78 : x
  2. Step 2: Convert to fraction form
    498,494.28/687,918.60 = 272,139.78/x
  3. Step 3: Cross multiply
    498,494.28x = 687,918.60 × 272,139.78
  4. Step 4: Simplify right side
    498,494.28x = 187,210,016,461.91
  5. Step 5: Solve for x
    x = 187,210,016,461.91/498,494.28
  6. Step 6: Final answer
    x = 375,550.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.