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Finding the Fourth Proportional to 20.20, 27.82 and 15.32

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Solution

The fourth proportional to 20.20, 27.82 and 15.32 is: 21.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.20 : 27.82 = 15.32 : x
  2. Step 2: Convert to fraction form
    20.20/27.82 = 15.32/x
  3. Step 3: Cross multiply
    20.20x = 27.82 × 15.32
  4. Step 4: Simplify right side
    20.20x = 426.20
  5. Step 5: Solve for x
    x = 426.20/20.20
  6. Step 6: Final answer
    x = 21.10

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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.