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Finding the Fourth Proportional to 81.16, 122.17 and 61.12

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Solution

The fourth proportional to 81.16, 122.17 and 61.12 is: 92.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.16 : 122.17 = 61.12 : x
  2. Step 2: Convert to fraction form
    81.16/122.17 = 61.12/x
  3. Step 3: Cross multiply
    81.16x = 122.17 × 61.12
  4. Step 4: Simplify right side
    81.16x = 7,467.03
  5. Step 5: Solve for x
    x = 7,467.03/81.16
  6. Step 6: Final answer
    x = 92.00

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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.