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Finding the Fourth Proportional to 129.38, 194.13 and 65.25

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Solution

The fourth proportional to 129.38, 194.13 and 65.25 is: 97.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.38 : 194.13 = 65.25 : x
  2. Step 2: Convert to fraction form
    129.38/194.13 = 65.25/x
  3. Step 3: Cross multiply
    129.38x = 194.13 × 65.25
  4. Step 4: Simplify right side
    129.38x = 12,666.98
  5. Step 5: Solve for x
    x = 12,666.98/129.38
  6. Step 6: Final answer
    x = 97.91

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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.