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Finding the Fourth Proportional to 88.80, 122.64 and 81.52

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Solution

The fourth proportional to 88.80, 122.64 and 81.52 is: 112.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.80 : 122.64 = 81.52 : x
  2. Step 2: Convert to fraction form
    88.80/122.64 = 81.52/x
  3. Step 3: Cross multiply
    88.80x = 122.64 × 81.52
  4. Step 4: Simplify right side
    88.80x = 9,997.61
  5. Step 5: Solve for x
    x = 9,997.61/88.80
  6. Step 6: Final answer
    x = 112.59

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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.