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Finding the Fourth Proportional to 31.06, 43.16 and 30.73

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Solution

The fourth proportional to 31.06, 43.16 and 30.73 is: 42.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.06 : 43.16 = 30.73 : x
  2. Step 2: Convert to fraction form
    31.06/43.16 = 30.73/x
  3. Step 3: Cross multiply
    31.06x = 43.16 × 30.73
  4. Step 4: Simplify right side
    31.06x = 1,326.31
  5. Step 5: Solve for x
    x = 1,326.31/31.06
  6. Step 6: Final answer
    x = 42.70

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.