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Finding the Fourth Proportional to 20.20, 27.86 and 18.76

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Solution

The fourth proportional to 20.20, 27.86 and 18.76 is: 25.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.20 : 27.86 = 18.76 : x
  2. Step 2: Convert to fraction form
    20.20/27.86 = 18.76/x
  3. Step 3: Cross multiply
    20.20x = 27.86 × 18.76
  4. Step 4: Simplify right side
    20.20x = 522.65
  5. Step 5: Solve for x
    x = 522.65/20.20
  6. Step 6: Final answer
    x = 25.87

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Find fourth proportional to 10.10, 13.93 and 9.38
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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.