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Finding the Fourth Proportional to 21.62, 32.56 and 20.24

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Solution

The fourth proportional to 21.62, 32.56 and 20.24 is: 30.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.62 : 32.56 = 20.24 : x
  2. Step 2: Convert to fraction form
    21.62/32.56 = 20.24/x
  3. Step 3: Cross multiply
    21.62x = 32.56 × 20.24
  4. Step 4: Simplify right side
    21.62x = 659.01
  5. Step 5: Solve for x
    x = 659.01/21.62
  6. Step 6: Final answer
    x = 30.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.