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Finding the Fourth Proportional to 81.30, 122.36 and 74.90

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Solution

The fourth proportional to 81.30, 122.36 and 74.90 is: 112.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.30 : 122.36 = 74.90 : x
  2. Step 2: Convert to fraction form
    81.30/122.36 = 74.90/x
  3. Step 3: Cross multiply
    81.30x = 122.36 × 74.90
  4. Step 4: Simplify right side
    81.30x = 9,164.76
  5. Step 5: Solve for x
    x = 9,164.76/81.30
  6. Step 6: Final answer
    x = 112.73

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.