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Finding the Fourth Proportional to 129.39, 193.80 and 93.21

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Solution

The fourth proportional to 129.39, 193.80 and 93.21 is: 139.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.39 : 193.80 = 93.21 : x
  2. Step 2: Convert to fraction form
    129.39/193.80 = 93.21/x
  3. Step 3: Cross multiply
    129.39x = 193.80 × 93.21
  4. Step 4: Simplify right side
    129.39x = 18,064.10
  5. Step 5: Solve for x
    x = 18,064.10/129.39
  6. Step 6: Final answer
    x = 139.61

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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.