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Finding the Fourth Proportional to 129.35, 193.91 and 90.92

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Solution

The fourth proportional to 129.35, 193.91 and 90.92 is: 136.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.35 : 193.91 = 90.92 : x
  2. Step 2: Convert to fraction form
    129.35/193.91 = 90.92/x
  3. Step 3: Cross multiply
    129.35x = 193.91 × 90.92
  4. Step 4: Simplify right side
    129.35x = 17,630.33
  5. Step 5: Solve for x
    x = 17,630.33/129.35
  6. Step 6: Final answer
    x = 136.30

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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.