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Finding the Fourth Proportional to 129.37, 193.45 and 100.15

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Solution

The fourth proportional to 129.37, 193.45 and 100.15 is: 149.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.37 : 193.45 = 100.15 : x
  2. Step 2: Convert to fraction form
    129.37/193.45 = 100.15/x
  3. Step 3: Cross multiply
    129.37x = 193.45 × 100.15
  4. Step 4: Simplify right side
    129.37x = 19,372.80
  5. Step 5: Solve for x
    x = 19,372.80/129.37
  6. Step 6: Final answer
    x = 149.75

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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.