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Finding the Fourth Proportional to 31.73, 47.61 and 21.60

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Solution

The fourth proportional to 31.73, 47.61 and 21.60 is: 32.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.73 : 47.61 = 21.60 : x
  2. Step 2: Convert to fraction form
    31.73/47.61 = 21.60/x
  3. Step 3: Cross multiply
    31.73x = 47.61 × 21.60
  4. Step 4: Simplify right side
    31.73x = 1,028.38
  5. Step 5: Solve for x
    x = 1,028.38/31.73
  6. Step 6: Final answer
    x = 32.41

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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.