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Finding the Fourth Proportional to 424.12, 636.24 and 131.65

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Solution

The fourth proportional to 424.12, 636.24 and 131.65 is: 197.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.12 : 636.24 = 131.65 : x
  2. Step 2: Convert to fraction form
    424.12/636.24 = 131.65/x
  3. Step 3: Cross multiply
    424.12x = 636.24 × 131.65
  4. Step 4: Simplify right side
    424.12x = 83,761.00
  5. Step 5: Solve for x
    x = 83,761.00/424.12
  6. Step 6: Final answer
    x = 197.49

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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.