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Finding the Fourth Proportional to 116.91, 175.20 and 86.22

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Solution

The fourth proportional to 116.91, 175.20 and 86.22 is: 129.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.91 : 175.20 = 86.22 : x
  2. Step 2: Convert to fraction form
    116.91/175.20 = 86.22/x
  3. Step 3: Cross multiply
    116.91x = 175.20 × 86.22
  4. Step 4: Simplify right side
    116.91x = 15,105.74
  5. Step 5: Solve for x
    x = 15,105.74/116.91
  6. Step 6: Final answer
    x = 129.21

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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.