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Finding the Fourth Proportional to 81.68, 122.46 and 32.91

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Solution

The fourth proportional to 81.68, 122.46 and 32.91 is: 49.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.68 : 122.46 = 32.91 : x
  2. Step 2: Convert to fraction form
    81.68/122.46 = 32.91/x
  3. Step 3: Cross multiply
    81.68x = 122.46 × 32.91
  4. Step 4: Simplify right side
    81.68x = 4,030.16
  5. Step 5: Solve for x
    x = 4,030.16/81.68
  6. Step 6: Final answer
    x = 49.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.