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Finding the Fourth Proportional to 424.39, 636.69 and 131.88

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Solution

The fourth proportional to 424.39, 636.69 and 131.88 is: 197.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.39 : 636.69 = 131.88 : x
  2. Step 2: Convert to fraction form
    424.39/636.69 = 131.88/x
  3. Step 3: Cross multiply
    424.39x = 636.69 × 131.88
  4. Step 4: Simplify right side
    424.39x = 83,966.68
  5. Step 5: Solve for x
    x = 83,966.68/424.39
  6. Step 6: Final answer
    x = 197.85

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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.