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Finding the Fourth Proportional to 31.29, 43.20 and 23.15

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Solution

The fourth proportional to 31.29, 43.20 and 23.15 is: 31.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.29 : 43.20 = 23.15 : x
  2. Step 2: Convert to fraction form
    31.29/43.20 = 23.15/x
  3. Step 3: Cross multiply
    31.29x = 43.20 × 23.15
  4. Step 4: Simplify right side
    31.29x = 999.86
  5. Step 5: Solve for x
    x = 999.86/31.29
  6. Step 6: Final answer
    x = 31.95

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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.