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Finding the Fourth Proportional to 31.32, 47 and 20.52

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Solution

The fourth proportional to 31.32, 47 and 20.52 is: 30.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.32 : 47 = 20.52 : x
  2. Step 2: Convert to fraction form
    31.32/47 = 20.52/x
  3. Step 3: Cross multiply
    31.32x = 47 × 20.52
  4. Step 4: Simplify right side
    31.32x = 964.44
  5. Step 5: Solve for x
    x = 964.44/31.32
  6. Step 6: Final answer
    x = 30.79

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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.