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Finding the Fourth Proportional to 31.42, 47.10 and 15.38

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Solution

The fourth proportional to 31.42, 47.10 and 15.38 is: 23.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.42 : 47.10 = 15.38 : x
  2. Step 2: Convert to fraction form
    31.42/47.10 = 15.38/x
  3. Step 3: Cross multiply
    31.42x = 47.10 × 15.38
  4. Step 4: Simplify right side
    31.42x = 724.40
  5. Step 5: Solve for x
    x = 724.40/31.42
  6. Step 6: Final answer
    x = 23.06

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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.