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Finding the Fourth Proportional to 31.91, 43.80 and 31.01

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Solution

The fourth proportional to 31.91, 43.80 and 31.01 is: 42.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.91 : 43.80 = 31.01 : x
  2. Step 2: Convert to fraction form
    31.91/43.80 = 31.01/x
  3. Step 3: Cross multiply
    31.91x = 43.80 × 31.01
  4. Step 4: Simplify right side
    31.91x = 1,358.08
  5. Step 5: Solve for x
    x = 1,358.08/31.91
  6. Step 6: Final answer
    x = 42.56

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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.