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Finding the Fourth Proportional to 60.80, 91.20 and 37.90

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Solution

The fourth proportional to 60.80, 91.20 and 37.90 is: 56.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.80 : 91.20 = 37.90 : x
  2. Step 2: Convert to fraction form
    60.80/91.20 = 37.90/x
  3. Step 3: Cross multiply
    60.80x = 91.20 × 37.90
  4. Step 4: Simplify right side
    60.80x = 3,456.48
  5. Step 5: Solve for x
    x = 3,456.48/60.80
  6. Step 6: Final answer
    x = 56.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.