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Finding the Fourth Proportional to 31.89, 43.99 and 28.41

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Solution

The fourth proportional to 31.89, 43.99 and 28.41 is: 39.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.89 : 43.99 = 28.41 : x
  2. Step 2: Convert to fraction form
    31.89/43.99 = 28.41/x
  3. Step 3: Cross multiply
    31.89x = 43.99 × 28.41
  4. Step 4: Simplify right side
    31.89x = 1,249.80
  5. Step 5: Solve for x
    x = 1,249.80/31.89
  6. Step 6: Final answer
    x = 39.20

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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.