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Finding the Fourth Proportional to 81.59, 122.29 and 55.91

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Solution

The fourth proportional to 81.59, 122.29 and 55.91 is: 83.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.59 : 122.29 = 55.91 : x
  2. Step 2: Convert to fraction form
    81.59/122.29 = 55.91/x
  3. Step 3: Cross multiply
    81.59x = 122.29 × 55.91
  4. Step 4: Simplify right side
    81.59x = 6,837.40
  5. Step 5: Solve for x
    x = 6,837.40/81.59
  6. Step 6: Final answer
    x = 83.81

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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.