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Finding the Fourth Proportional to 96.28, 132.90 and 87.64

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Solution

The fourth proportional to 96.28, 132.90 and 87.64 is: 120.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.28 : 132.90 = 87.64 : x
  2. Step 2: Convert to fraction form
    96.28/132.90 = 87.64/x
  3. Step 3: Cross multiply
    96.28x = 132.90 × 87.64
  4. Step 4: Simplify right side
    96.28x = 11,647.36
  5. Step 5: Solve for x
    x = 11,647.36/96.28
  6. Step 6: Final answer
    x = 120.97

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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.