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Finding the Fourth Proportional to 26.20, 39.38 and 21.72

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Solution

The fourth proportional to 26.20, 39.38 and 21.72 is: 32.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.20 : 39.38 = 21.72 : x
  2. Step 2: Convert to fraction form
    26.20/39.38 = 21.72/x
  3. Step 3: Cross multiply
    26.20x = 39.38 × 21.72
  4. Step 4: Simplify right side
    26.20x = 855.33
  5. Step 5: Solve for x
    x = 855.33/26.20
  6. Step 6: Final answer
    x = 32.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.