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Finding the Fourth Proportional to 615,689.60, 921,566.10 and 438,542.60

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Solution

The fourth proportional to 615,689.60, 921,566.10 and 438,542.60 is: 656,411.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,689.60 : 921,566.10 = 438,542.60 : x
  2. Step 2: Convert to fraction form
    615,689.60/921,566.10 = 438,542.60/x
  3. Step 3: Cross multiply
    615,689.60x = 921,566.10 × 438,542.60
  4. Step 4: Simplify right side
    615,689.60x = 404,145,993,565.86
  5. Step 5: Solve for x
    x = 404,145,993,565.86/615,689.60
  6. Step 6: Final answer
    x = 656,411.92

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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.