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Finding the Fourth Proportional to 31.76, 43.83 and 17.20

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Solution

The fourth proportional to 31.76, 43.83 and 17.20 is: 23.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.76 : 43.83 = 17.20 : x
  2. Step 2: Convert to fraction form
    31.76/43.83 = 17.20/x
  3. Step 3: Cross multiply
    31.76x = 43.83 × 17.20
  4. Step 4: Simplify right side
    31.76x = 754.04
  5. Step 5: Solve for x
    x = 754.04/31.76
  6. Step 6: Final answer
    x = 23.74

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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.