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Finding the Fourth Proportional to 96.42, 132.78 and 77.88

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Solution

The fourth proportional to 96.42, 132.78 and 77.88 is: 107.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.42 : 132.78 = 77.88 : x
  2. Step 2: Convert to fraction form
    96.42/132.78 = 77.88/x
  3. Step 3: Cross multiply
    96.42x = 132.78 × 77.88
  4. Step 4: Simplify right side
    96.42x = 10,340.91
  5. Step 5: Solve for x
    x = 10,340.91/96.42
  6. Step 6: Final answer
    x = 107.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.