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Finding the Fourth Proportional to 636.72, 876.12 and 517.68

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Solution

The fourth proportional to 636.72, 876.12 and 517.68 is: 712.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.72 : 876.12 = 517.68 : x
  2. Step 2: Convert to fraction form
    636.72/876.12 = 517.68/x
  3. Step 3: Cross multiply
    636.72x = 876.12 × 517.68
  4. Step 4: Simplify right side
    636.72x = 453,549.80
  5. Step 5: Solve for x
    x = 453,549.80/636.72
  6. Step 6: Final answer
    x = 712.32

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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.