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Finding the Fourth Proportional to 26.60, 36.71 and 20.78

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Solution

The fourth proportional to 26.60, 36.71 and 20.78 is: 28.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.60 : 36.71 = 20.78 : x
  2. Step 2: Convert to fraction form
    26.60/36.71 = 20.78/x
  3. Step 3: Cross multiply
    26.60x = 36.71 × 20.78
  4. Step 4: Simplify right side
    26.60x = 762.76
  5. Step 5: Solve for x
    x = 762.76/26.60
  6. Step 6: Final answer
    x = 28.68

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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.