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Finding the Fourth Proportional to 26.19, 36.19 and 20.78

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Solution

The fourth proportional to 26.19, 36.19 and 20.78 is: 28.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.19 : 36.19 = 20.78 : x
  2. Step 2: Convert to fraction form
    26.19/36.19 = 20.78/x
  3. Step 3: Cross multiply
    26.19x = 36.19 × 20.78
  4. Step 4: Simplify right side
    26.19x = 751.80
  5. Step 5: Solve for x
    x = 751.80/26.19
  6. Step 6: Final answer
    x = 28.71

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Find fourth proportional to 13.10, 18.09 and 10.39
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1.5x scale

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.