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Finding the Fourth Proportional to 114.60, 171.24 and 86.62

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Solution

The fourth proportional to 114.60, 171.24 and 86.62 is: 129.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.60 : 171.24 = 86.62 : x
  2. Step 2: Convert to fraction form
    114.60/171.24 = 86.62/x
  3. Step 3: Cross multiply
    114.60x = 171.24 × 86.62
  4. Step 4: Simplify right side
    114.60x = 14,833.45
  5. Step 5: Solve for x
    x = 14,833.45/114.60
  6. Step 6: Final answer
    x = 129.43

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.