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Finding the Fourth Proportional to 81.39, 112.29 and 55.22

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Solution

The fourth proportional to 81.39, 112.29 and 55.22 is: 76.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.39 : 112.29 = 55.22 : x
  2. Step 2: Convert to fraction form
    81.39/112.29 = 55.22/x
  3. Step 3: Cross multiply
    81.39x = 112.29 × 55.22
  4. Step 4: Simplify right side
    81.39x = 6,200.09
  5. Step 5: Solve for x
    x = 6,200.09/81.39
  6. Step 6: Final answer
    x = 76.18

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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.