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Finding the Fourth Proportional to 718,456.35, 991,476.68 and 396,177.87

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Solution

The fourth proportional to 718,456.35, 991,476.68 and 396,177.87 is: 546,729.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,456.35 : 991,476.68 = 396,177.87 : x
  2. Step 2: Convert to fraction form
    718,456.35/991,476.68 = 396,177.87/x
  3. Step 3: Cross multiply
    718,456.35x = 991,476.68 × 396,177.87
  4. Step 4: Simplify right side
    718,456.35x = 392,801,119,237.07
  5. Step 5: Solve for x
    x = 392,801,119,237.07/718,456.35
  6. Step 6: Final answer
    x = 546,729.27

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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.