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Finding the Fourth Proportional to 31.73, 43.71 and 30.57

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Solution

The fourth proportional to 31.73, 43.71 and 30.57 is: 42.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.73 : 43.71 = 30.57 : x
  2. Step 2: Convert to fraction form
    31.73/43.71 = 30.57/x
  3. Step 3: Cross multiply
    31.73x = 43.71 × 30.57
  4. Step 4: Simplify right side
    31.73x = 1,336.21
  5. Step 5: Solve for x
    x = 1,336.21/31.73
  6. Step 6: Final answer
    x = 42.12

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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.