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Finding the Fourth Proportional to 81.34, 112.29 and 53.73

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Solution

The fourth proportional to 81.34, 112.29 and 53.73 is: 74.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.34 : 112.29 = 53.73 : x
  2. Step 2: Convert to fraction form
    81.34/112.29 = 53.73/x
  3. Step 3: Cross multiply
    81.34x = 112.29 × 53.73
  4. Step 4: Simplify right side
    81.34x = 6,033.14
  5. Step 5: Solve for x
    x = 6,033.14/81.34
  6. Step 6: Final answer
    x = 74.17

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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.