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Finding the Fourth Proportional to 129.29, 193.93 and 86.81

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Solution

The fourth proportional to 129.29, 193.93 and 86.81 is: 130.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.29 : 193.93 = 86.81 : x
  2. Step 2: Convert to fraction form
    129.29/193.93 = 86.81/x
  3. Step 3: Cross multiply
    129.29x = 193.93 × 86.81
  4. Step 4: Simplify right side
    129.29x = 16,833.88
  5. Step 5: Solve for x
    x = 16,833.88/129.29
  6. Step 6: Final answer
    x = 130.21

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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.