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Finding the Fourth Proportional to 31.52, 43.49 and 20.60

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Solution

The fourth proportional to 31.52, 43.49 and 20.60 is: 28.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.52 : 43.49 = 20.60 : x
  2. Step 2: Convert to fraction form
    31.52/43.49 = 20.60/x
  3. Step 3: Cross multiply
    31.52x = 43.49 × 20.60
  4. Step 4: Simplify right side
    31.52x = 895.89
  5. Step 5: Solve for x
    x = 895.89/31.52
  6. Step 6: Final answer
    x = 28.42

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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.