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Finding the Fourth Proportional to 80.76, 111.42 and 73

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Solution

The fourth proportional to 80.76, 111.42 and 73 is: 100.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.76 : 111.42 = 73 : x
  2. Step 2: Convert to fraction form
    80.76/111.42 = 73/x
  3. Step 3: Cross multiply
    80.76x = 111.42 × 73
  4. Step 4: Simplify right side
    80.76x = 8,133.66
  5. Step 5: Solve for x
    x = 8,133.66/80.76
  6. Step 6: Final answer
    x = 100.71

Related Problems

Find fourth proportional to 40.38, 55.71 and 36.50
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1.5x scale

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.