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Finding the Fourth Proportional to 81.95, 112.97 and 57.31

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Solution

The fourth proportional to 81.95, 112.97 and 57.31 is: 79.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.95 : 112.97 = 57.31 : x
  2. Step 2: Convert to fraction form
    81.95/112.97 = 57.31/x
  3. Step 3: Cross multiply
    81.95x = 112.97 × 57.31
  4. Step 4: Simplify right side
    81.95x = 6,474.24
  5. Step 5: Solve for x
    x = 6,474.24/81.95
  6. Step 6: Final answer
    x = 79.00

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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.