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Finding the Fourth Proportional to 37.18, 51.30 and 20.80

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Solution

The fourth proportional to 37.18, 51.30 and 20.80 is: 28.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    37.18 : 51.30 = 20.80 : x
  2. Step 2: Convert to fraction form
    37.18/51.30 = 20.80/x
  3. Step 3: Cross multiply
    37.18x = 51.30 × 20.80
  4. Step 4: Simplify right side
    37.18x = 1,067.20
  5. Step 5: Solve for x
    x = 1,067.20/37.18
  6. Step 6: Final answer
    x = 28.71

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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.