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Finding the Fourth Proportional to 81.30, 112.24 and 56.73

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Solution

The fourth proportional to 81.30, 112.24 and 56.73 is: 78.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.30 : 112.24 = 56.73 : x
  2. Step 2: Convert to fraction form
    81.30/112.24 = 56.73/x
  3. Step 3: Cross multiply
    81.30x = 112.24 × 56.73
  4. Step 4: Simplify right side
    81.30x = 6,367.38
  5. Step 5: Solve for x
    x = 6,367.38/81.30
  6. Step 6: Final answer
    x = 78.32

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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.