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Finding the Fourth Proportional to 21.38, 29.26 and 20.96

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Solution

The fourth proportional to 21.38, 29.26 and 20.96 is: 28.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.38 : 29.26 = 20.96 : x
  2. Step 2: Convert to fraction form
    21.38/29.26 = 20.96/x
  3. Step 3: Cross multiply
    21.38x = 29.26 × 20.96
  4. Step 4: Simplify right side
    21.38x = 613.29
  5. Step 5: Solve for x
    x = 613.29/21.38
  6. Step 6: Final answer
    x = 28.69

Related Problems

Find fourth proportional to 10.69, 14.63 and 10.48
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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 (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.