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Finding the Fourth Proportional to 77.29, 115.76 and 65.79

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Solution

The fourth proportional to 77.29, 115.76 and 65.79 is: 98.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.29 : 115.76 = 65.79 : x
  2. Step 2: Convert to fraction form
    77.29/115.76 = 65.79/x
  3. Step 3: Cross multiply
    77.29x = 115.76 × 65.79
  4. Step 4: Simplify right side
    77.29x = 7,616.01
  5. Step 5: Solve for x
    x = 7,616.01/77.29
  6. Step 6: Final answer
    x = 98.54

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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.