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Finding the Fourth Proportional to 31.68, 43.78 and 26.21

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Solution

The fourth proportional to 31.68, 43.78 and 26.21 is: 36.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.68 : 43.78 = 26.21 : x
  2. Step 2: Convert to fraction form
    31.68/43.78 = 26.21/x
  3. Step 3: Cross multiply
    31.68x = 43.78 × 26.21
  4. Step 4: Simplify right side
    31.68x = 1,147.47
  5. Step 5: Solve for x
    x = 1,147.47/31.68
  6. Step 6: Final answer
    x = 36.22

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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.