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Finding the Fourth Proportional to 718,322.88, 991,288.16 and 396,025.92

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Solution

The fourth proportional to 718,322.88, 991,288.16 and 396,025.92 is: 546,517.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,322.88 : 991,288.16 = 396,025.92 : x
  2. Step 2: Convert to fraction form
    718,322.88/991,288.16 = 396,025.92/x
  3. Step 3: Cross multiply
    718,322.88x = 991,288.16 × 396,025.92
  4. Step 4: Simplify right side
    718,322.88x = 392,575,805,549.11
  5. Step 5: Solve for x
    x = 392,575,805,549.11/718,322.88
  6. Step 6: Final answer
    x = 546,517.20

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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.