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Finding the Fourth Proportional to 83.86, 114.89 and 80.62

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Solution

The fourth proportional to 83.86, 114.89 and 80.62 is: 110.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.86 : 114.89 = 80.62 : x
  2. Step 2: Convert to fraction form
    83.86/114.89 = 80.62/x
  3. Step 3: Cross multiply
    83.86x = 114.89 × 80.62
  4. Step 4: Simplify right side
    83.86x = 9,262.43
  5. Step 5: Solve for x
    x = 9,262.43/83.86
  6. Step 6: Final answer
    x = 110.45

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.