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Finding the Fourth Proportional to 31.68, 47.50 and 21.91

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Solution

The fourth proportional to 31.68, 47.50 and 21.91 is: 32.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.68 : 47.50 = 21.91 : x
  2. Step 2: Convert to fraction form
    31.68/47.50 = 21.91/x
  3. Step 3: Cross multiply
    31.68x = 47.50 × 21.91
  4. Step 4: Simplify right side
    31.68x = 1,040.73
  5. Step 5: Solve for x
    x = 1,040.73/31.68
  6. Step 6: Final answer
    x = 32.85

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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.