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Finding the Fourth Proportional to 26.56, 39.85 and 21.78

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Solution

The fourth proportional to 26.56, 39.85 and 21.78 is: 32.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.56 : 39.85 = 21.78 : x
  2. Step 2: Convert to fraction form
    26.56/39.85 = 21.78/x
  3. Step 3: Cross multiply
    26.56x = 39.85 × 21.78
  4. Step 4: Simplify right side
    26.56x = 867.93
  5. Step 5: Solve for x
    x = 867.93/26.56
  6. Step 6: Final answer
    x = 32.68

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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.