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Finding the Fourth Proportional to 96.80, 132.80 and 89.60

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Solution

The fourth proportional to 96.80, 132.80 and 89.60 is: 122.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.80 : 132.80 = 89.60 : x
  2. Step 2: Convert to fraction form
    96.80/132.80 = 89.60/x
  3. Step 3: Cross multiply
    96.80x = 132.80 × 89.60
  4. Step 4: Simplify right side
    96.80x = 11,898.88
  5. Step 5: Solve for x
    x = 11,898.88/96.80
  6. Step 6: Final answer
    x = 122.92

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.