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Finding the Fourth Proportional to 424.12, 636.18 and 135.56

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Solution

The fourth proportional to 424.12, 636.18 and 135.56 is: 203.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.12 : 636.18 = 135.56 : x
  2. Step 2: Convert to fraction form
    424.12/636.18 = 135.56/x
  3. Step 3: Cross multiply
    424.12x = 636.18 × 135.56
  4. Step 4: Simplify right side
    424.12x = 86,240.56
  5. Step 5: Solve for x
    x = 86,240.56/424.12
  6. Step 6: Final answer
    x = 203.34

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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.