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Finding the Fourth Proportional to 81.66, 112.72 and 50.63

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Solution

The fourth proportional to 81.66, 112.72 and 50.63 is: 69.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.66 : 112.72 = 50.63 : x
  2. Step 2: Convert to fraction form
    81.66/112.72 = 50.63/x
  3. Step 3: Cross multiply
    81.66x = 112.72 × 50.63
  4. Step 4: Simplify right side
    81.66x = 5,706.28
  5. Step 5: Solve for x
    x = 5,706.28/81.66
  6. Step 6: Final answer
    x = 69.88

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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.