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Finding the Fourth Proportional to 129.52, 194.20 and 78.16

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Solution

The fourth proportional to 129.52, 194.20 and 78.16 is: 117.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.52 : 194.20 = 78.16 : x
  2. Step 2: Convert to fraction form
    129.52/194.20 = 78.16/x
  3. Step 3: Cross multiply
    129.52x = 194.20 × 78.16
  4. Step 4: Simplify right side
    129.52x = 15,178.67
  5. Step 5: Solve for x
    x = 15,178.67/129.52
  6. Step 6: Final answer
    x = 117.19

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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.