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Finding the Fourth Proportional to 31.29, 43.16 and 27.79

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Solution

The fourth proportional to 31.29, 43.16 and 27.79 is: 38.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.29 : 43.16 = 27.79 : x
  2. Step 2: Convert to fraction form
    31.29/43.16 = 27.79/x
  3. Step 3: Cross multiply
    31.29x = 43.16 × 27.79
  4. Step 4: Simplify right side
    31.29x = 1,199.41
  5. Step 5: Solve for x
    x = 1,199.41/31.29
  6. Step 6: Final answer
    x = 38.33

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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.