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Finding the Fourth Proportional to 129.22, 193.69 and 90.59

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Solution

The fourth proportional to 129.22, 193.69 and 90.59 is: 135.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.22 : 193.69 = 90.59 : x
  2. Step 2: Convert to fraction form
    129.22/193.69 = 90.59/x
  3. Step 3: Cross multiply
    129.22x = 193.69 × 90.59
  4. Step 4: Simplify right side
    129.22x = 17,546.38
  5. Step 5: Solve for x
    x = 17,546.38/129.22
  6. Step 6: Final answer
    x = 135.79

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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.