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Finding the Fourth Proportional to 31.24, 43.12 and 21.56

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Solution

The fourth proportional to 31.24, 43.12 and 21.56 is: 29.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.24 : 43.12 = 21.56 : x
  2. Step 2: Convert to fraction form
    31.24/43.12 = 21.56/x
  3. Step 3: Cross multiply
    31.24x = 43.12 × 21.56
  4. Step 4: Simplify right side
    31.24x = 929.67
  5. Step 5: Solve for x
    x = 929.67/31.24
  6. Step 6: Final answer
    x = 29.76

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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.