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Finding the Fourth Proportional to 47.31, 71.10 and 31.38

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Solution

The fourth proportional to 47.31, 71.10 and 31.38 is: 47.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.31 : 71.10 = 31.38 : x
  2. Step 2: Convert to fraction form
    47.31/71.10 = 31.38/x
  3. Step 3: Cross multiply
    47.31x = 71.10 × 31.38
  4. Step 4: Simplify right side
    47.31x = 2,231.12
  5. Step 5: Solve for x
    x = 2,231.12/47.31
  6. Step 6: Final answer
    x = 47.16

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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.