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Finding the Fourth Proportional to 129.52, 193.98 and 74.68

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Solution

The fourth proportional to 129.52, 193.98 and 74.68 is: 111.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.52 : 193.98 = 74.68 : x
  2. Step 2: Convert to fraction form
    129.52/193.98 = 74.68/x
  3. Step 3: Cross multiply
    129.52x = 193.98 × 74.68
  4. Step 4: Simplify right side
    129.52x = 14,486.43
  5. Step 5: Solve for x
    x = 14,486.43/129.52
  6. Step 6: Final answer
    x = 111.85

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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.