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Finding the Fourth Proportional to 80.71, 111.39 and 47.98

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Solution

The fourth proportional to 80.71, 111.39 and 47.98 is: 66.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.71 : 111.39 = 47.98 : x
  2. Step 2: Convert to fraction form
    80.71/111.39 = 47.98/x
  3. Step 3: Cross multiply
    80.71x = 111.39 × 47.98
  4. Step 4: Simplify right side
    80.71x = 5,344.21
  5. Step 5: Solve for x
    x = 5,344.21/80.71
  6. Step 6: Final answer
    x = 66.22

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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.