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Finding the Fourth Proportional to 26.76, 36.91 and 20.61

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Solution

The fourth proportional to 26.76, 36.91 and 20.61 is: 28.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.76 : 36.91 = 20.61 : x
  2. Step 2: Convert to fraction form
    26.76/36.91 = 20.61/x
  3. Step 3: Cross multiply
    26.76x = 36.91 × 20.61
  4. Step 4: Simplify right side
    26.76x = 760.74
  5. Step 5: Solve for x
    x = 760.74/26.76
  6. Step 6: Final answer
    x = 28.42

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Find fourth proportional to 13.38, 18.46 and 10.31
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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.