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Finding the Fourth Proportional to 718,314.64, 991,318.87 and 396,024.24

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Solution

The fourth proportional to 718,314.64, 991,318.87 and 396,024.24 is: 546,538.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,314.64 : 991,318.87 = 396,024.24 : x
  2. Step 2: Convert to fraction form
    718,314.64/991,318.87 = 396,024.24/x
  3. Step 3: Cross multiply
    718,314.64x = 991,318.87 × 396,024.24
  4. Step 4: Simplify right side
    718,314.64x = 392,586,302,089.41
  5. Step 5: Solve for x
    x = 392,586,302,089.41/718,314.64
  6. Step 6: Final answer
    x = 546,538.08

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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.