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Finding the Fourth Proportional to 31.71, 47.48 and 26.90

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Solution

The fourth proportional to 31.71, 47.48 and 26.90 is: 40.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.71 : 47.48 = 26.90 : x
  2. Step 2: Convert to fraction form
    31.71/47.48 = 26.90/x
  3. Step 3: Cross multiply
    31.71x = 47.48 × 26.90
  4. Step 4: Simplify right side
    31.71x = 1,276.84
  5. Step 5: Solve for x
    x = 1,276.84/31.71
  6. Step 6: Final answer
    x = 40.27

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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.