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Finding the Fourth Proportional to 31.48, 47.22 and 20.86

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Solution

The fourth proportional to 31.48, 47.22 and 20.86 is: 31.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.48 : 47.22 = 20.86 : x
  2. Step 2: Convert to fraction form
    31.48/47.22 = 20.86/x
  3. Step 3: Cross multiply
    31.48x = 47.22 × 20.86
  4. Step 4: Simplify right side
    31.48x = 985.01
  5. Step 5: Solve for x
    x = 985.01/31.48
  6. Step 6: Final answer
    x = 31.29

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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.