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Finding the Fourth Proportional to 424.11, 636.27 and 135.55

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Solution

The fourth proportional to 424.11, 636.27 and 135.55 is: 203.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.11 : 636.27 = 135.55 : x
  2. Step 2: Convert to fraction form
    424.11/636.27 = 135.55/x
  3. Step 3: Cross multiply
    424.11x = 636.27 × 135.55
  4. Step 4: Simplify right side
    424.11x = 86,243.22
  5. Step 5: Solve for x
    x = 86,243.22/424.11
  6. Step 6: Final answer
    x = 203.35

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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.