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Finding the Fourth Proportional to 76.76, 115.29 and 65.42

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Solution

The fourth proportional to 76.76, 115.29 and 65.42 is: 98.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.76 : 115.29 = 65.42 : x
  2. Step 2: Convert to fraction form
    76.76/115.29 = 65.42/x
  3. Step 3: Cross multiply
    76.76x = 115.29 × 65.42
  4. Step 4: Simplify right side
    76.76x = 7,541.70
  5. Step 5: Solve for x
    x = 7,541.70/76.76
  6. Step 6: Final answer
    x = 98.26

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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.