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Finding the Fourth Proportional to 129.18, 193.79 and 52.15

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Solution

The fourth proportional to 129.18, 193.79 and 52.15 is: 78.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.18 : 193.79 = 52.15 : x
  2. Step 2: Convert to fraction form
    129.18/193.79 = 52.15/x
  3. Step 3: Cross multiply
    129.18x = 193.79 × 52.15
  4. Step 4: Simplify right side
    129.18x = 10,105.89
  5. Step 5: Solve for x
    x = 10,105.89/129.18
  6. Step 6: Final answer
    x = 78.23

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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.