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Finding the Fourth Proportional to 114.59, 158.07 and 86.91

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Solution

The fourth proportional to 114.59, 158.07 and 86.91 is: 119.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.59 : 158.07 = 86.91 : x
  2. Step 2: Convert to fraction form
    114.59/158.07 = 86.91/x
  3. Step 3: Cross multiply
    114.59x = 158.07 × 86.91
  4. Step 4: Simplify right side
    114.59x = 13,737.86
  5. Step 5: Solve for x
    x = 13,737.86/114.59
  6. Step 6: Final answer
    x = 119.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.