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Finding the Fourth Proportional to 129.55, 193.87 and 98.87

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Solution

The fourth proportional to 129.55, 193.87 and 98.87 is: 147.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.55 : 193.87 = 98.87 : x
  2. Step 2: Convert to fraction form
    129.55/193.87 = 98.87/x
  3. Step 3: Cross multiply
    129.55x = 193.87 × 98.87
  4. Step 4: Simplify right side
    129.55x = 19,167.68
  5. Step 5: Solve for x
    x = 19,167.68/129.55
  6. Step 6: Final answer
    x = 147.96

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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.