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Finding the Fourth Proportional to 615.29, 921.71 and 499.86

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Solution

The fourth proportional to 615.29, 921.71 and 499.86 is: 748.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.29 : 921.71 = 499.86 : x
  2. Step 2: Convert to fraction form
    615.29/921.71 = 499.86/x
  3. Step 3: Cross multiply
    615.29x = 921.71 × 499.86
  4. Step 4: Simplify right side
    615.29x = 460,727.21
  5. Step 5: Solve for x
    x = 460,727.21/615.29
  6. Step 6: Final answer
    x = 748.80

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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.