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Finding the Fourth Proportional to 31.42, 47.08 and 19.38

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Solution

The fourth proportional to 31.42, 47.08 and 19.38 is: 29.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.42 : 47.08 = 19.38 : x
  2. Step 2: Convert to fraction form
    31.42/47.08 = 19.38/x
  3. Step 3: Cross multiply
    31.42x = 47.08 × 19.38
  4. Step 4: Simplify right side
    31.42x = 912.41
  5. Step 5: Solve for x
    x = 912.41/31.42
  6. Step 6: Final answer
    x = 29.04

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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.