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Finding the Fourth Proportional to 75.92, 113.38 and 66.80

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Solution

The fourth proportional to 75.92, 113.38 and 66.80 is: 99.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.92 : 113.38 = 66.80 : x
  2. Step 2: Convert to fraction form
    75.92/113.38 = 66.80/x
  3. Step 3: Cross multiply
    75.92x = 113.38 × 66.80
  4. Step 4: Simplify right side
    75.92x = 7,573.78
  5. Step 5: Solve for x
    x = 7,573.78/75.92
  6. Step 6: Final answer
    x = 99.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.