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Finding the Fourth Proportional to 81.70, 112.69 and 52.56

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Solution

The fourth proportional to 81.70, 112.69 and 52.56 is: 72.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.70 : 112.69 = 52.56 : x
  2. Step 2: Convert to fraction form
    81.70/112.69 = 52.56/x
  3. Step 3: Cross multiply
    81.70x = 112.69 × 52.56
  4. Step 4: Simplify right side
    81.70x = 5,922.99
  5. Step 5: Solve for x
    x = 5,922.99/81.70
  6. Step 6: Final answer
    x = 72.50

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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.