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Finding the Fourth Proportional to 96.40, 132.88 and 86.12

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Solution

The fourth proportional to 96.40, 132.88 and 86.12 is: 118.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.40 : 132.88 = 86.12 : x
  2. Step 2: Convert to fraction form
    96.40/132.88 = 86.12/x
  3. Step 3: Cross multiply
    96.40x = 132.88 × 86.12
  4. Step 4: Simplify right side
    96.40x = 11,443.63
  5. Step 5: Solve for x
    x = 11,443.63/96.40
  6. Step 6: Final answer
    x = 118.71

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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.