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Finding the Fourth Proportional to 76.50, 115.28 and 63.95

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Solution

The fourth proportional to 76.50, 115.28 and 63.95 is: 96.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.50 : 115.28 = 63.95 : x
  2. Step 2: Convert to fraction form
    76.50/115.28 = 63.95/x
  3. Step 3: Cross multiply
    76.50x = 115.28 × 63.95
  4. Step 4: Simplify right side
    76.50x = 7,371.74
  5. Step 5: Solve for x
    x = 7,371.74/76.50
  6. Step 6: Final answer
    x = 96.36

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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.