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Finding the Fourth Proportional to 83.60, 125.64 and 76.96

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Solution

The fourth proportional to 83.60, 125.64 and 76.96 is: 115.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.60 : 125.64 = 76.96 : x
  2. Step 2: Convert to fraction form
    83.60/125.64 = 76.96/x
  3. Step 3: Cross multiply
    83.60x = 125.64 × 76.96
  4. Step 4: Simplify right side
    83.60x = 9,669.25
  5. Step 5: Solve for x
    x = 9,669.25/83.60
  6. Step 6: Final answer
    x = 115.66

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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.