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Finding the Fourth Proportional to 20.34, 28 and 16.21

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Solution

The fourth proportional to 20.34, 28 and 16.21 is: 22.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.34 : 28 = 16.21 : x
  2. Step 2: Convert to fraction form
    20.34/28 = 16.21/x
  3. Step 3: Cross multiply
    20.34x = 28 × 16.21
  4. Step 4: Simplify right side
    20.34x = 453.88
  5. Step 5: Solve for x
    x = 453.88/20.34
  6. Step 6: Final answer
    x = 22.31

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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.