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Finding the Fourth Proportional to 20, 27.60 and 11.38

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Solution

The fourth proportional to 20, 27.60 and 11.38 is: 15.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20 : 27.60 = 11.38 : x
  2. Step 2: Convert to fraction form
    20/27.60 = 11.38/x
  3. Step 3: Cross multiply
    20x = 27.60 × 11.38
  4. Step 4: Simplify right side
    20x = 314.09
  5. Step 5: Solve for x
    x = 314.09/20
  6. Step 6: Final answer
    x = 15.70

Related Problems

Find fourth proportional to 10, 13.80 and 5.69
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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.