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Finding the Fourth Proportional to 424.38, 636.63 and 135.88

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Solution

The fourth proportional to 424.38, 636.63 and 135.88 is: 203.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.38 : 636.63 = 135.88 : x
  2. Step 2: Convert to fraction form
    424.38/636.63 = 135.88/x
  3. Step 3: Cross multiply
    424.38x = 636.63 × 135.88
  4. Step 4: Simplify right side
    424.38x = 86,505.28
  5. Step 5: Solve for x
    x = 86,505.28/424.38
  6. Step 6: Final answer
    x = 203.84

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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.