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Finding the Fourth Proportional to 27.66, 38.18 and 20.76

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Solution

The fourth proportional to 27.66, 38.18 and 20.76 is: 28.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.66 : 38.18 = 20.76 : x
  2. Step 2: Convert to fraction form
    27.66/38.18 = 20.76/x
  3. Step 3: Cross multiply
    27.66x = 38.18 × 20.76
  4. Step 4: Simplify right side
    27.66x = 792.62
  5. Step 5: Solve for x
    x = 792.62/27.66
  6. Step 6: Final answer
    x = 28.66

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Find fourth proportional to 13.83, 19.09 and 10.38
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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.