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Finding the Fourth Proportional to 20.11, 30 and 18.19

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Solution

The fourth proportional to 20.11, 30 and 18.19 is: 27.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.11 : 30 = 18.19 : x
  2. Step 2: Convert to fraction form
    20.11/30 = 18.19/x
  3. Step 3: Cross multiply
    20.11x = 30 × 18.19
  4. Step 4: Simplify right side
    20.11x = 545.70
  5. Step 5: Solve for x
    x = 545.70/20.11
  6. Step 6: Final answer
    x = 27.14

Related Problems

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.