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Finding the Fourth Proportional to 31.27, 43.15 and 19.61

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Solution

The fourth proportional to 31.27, 43.15 and 19.61 is: 27.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.27 : 43.15 = 19.61 : x
  2. Step 2: Convert to fraction form
    31.27/43.15 = 19.61/x
  3. Step 3: Cross multiply
    31.27x = 43.15 × 19.61
  4. Step 4: Simplify right side
    31.27x = 846.17
  5. Step 5: Solve for x
    x = 846.17/31.27
  6. Step 6: Final answer
    x = 27.06

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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.