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Finding the Fourth Proportional to 77.28, 116.50 and 76.48

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Solution

The fourth proportional to 77.28, 116.50 and 76.48 is: 115.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.28 : 116.50 = 76.48 : x
  2. Step 2: Convert to fraction form
    77.28/116.50 = 76.48/x
  3. Step 3: Cross multiply
    77.28x = 116.50 × 76.48
  4. Step 4: Simplify right side
    77.28x = 8,909.92
  5. Step 5: Solve for x
    x = 8,909.92/77.28
  6. Step 6: Final answer
    x = 115.29

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.