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Finding the Fourth Proportional to 424.78, 636.98 and 132.18

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Solution

The fourth proportional to 424.78, 636.98 and 132.18 is: 198.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.78 : 636.98 = 132.18 : x
  2. Step 2: Convert to fraction form
    424.78/636.98 = 132.18/x
  3. Step 3: Cross multiply
    424.78x = 636.98 × 132.18
  4. Step 4: Simplify right side
    424.78x = 84,196.02
  5. Step 5: Solve for x
    x = 84,196.02/424.78
  6. Step 6: Final answer
    x = 198.21

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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.