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Finding the Fourth Proportional to 21.52, 32.12 and 20.96

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Solution

The fourth proportional to 21.52, 32.12 and 20.96 is: 31.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.52 : 32.12 = 20.96 : x
  2. Step 2: Convert to fraction form
    21.52/32.12 = 20.96/x
  3. Step 3: Cross multiply
    21.52x = 32.12 × 20.96
  4. Step 4: Simplify right side
    21.52x = 673.24
  5. Step 5: Solve for x
    x = 673.24/21.52
  6. Step 6: Final answer
    x = 31.28

Related Problems

Find fourth proportional to 10.76, 16.06 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 (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.