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Finding the Fourth Proportional to 31.38, 42.88 and 29.96

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Solution

The fourth proportional to 31.38, 42.88 and 29.96 is: 40.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.38 : 42.88 = 29.96 : x
  2. Step 2: Convert to fraction form
    31.38/42.88 = 29.96/x
  3. Step 3: Cross multiply
    31.38x = 42.88 × 29.96
  4. Step 4: Simplify right side
    31.38x = 1,284.68
  5. Step 5: Solve for x
    x = 1,284.68/31.38
  6. Step 6: Final answer
    x = 40.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.