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Finding the Fourth Proportional to 31.46, 47.21 and 13.43

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Solution

The fourth proportional to 31.46, 47.21 and 13.43 is: 20.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.46 : 47.21 = 13.43 : x
  2. Step 2: Convert to fraction form
    31.46/47.21 = 13.43/x
  3. Step 3: Cross multiply
    31.46x = 47.21 × 13.43
  4. Step 4: Simplify right side
    31.46x = 634.08
  5. Step 5: Solve for x
    x = 634.08/31.46
  6. Step 6: Final answer
    x = 20.16

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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.