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Finding the Fourth Proportional to 31.34, 43.25 and 25.80

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Solution

The fourth proportional to 31.34, 43.25 and 25.80 is: 35.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.34 : 43.25 = 25.80 : x
  2. Step 2: Convert to fraction form
    31.34/43.25 = 25.80/x
  3. Step 3: Cross multiply
    31.34x = 43.25 × 25.80
  4. Step 4: Simplify right side
    31.34x = 1,115.72
  5. Step 5: Solve for x
    x = 1,115.72/31.34
  6. Step 6: Final answer
    x = 35.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.