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Finding the Fourth Proportional to 20.56, 28.30 and 19.42

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Solution

The fourth proportional to 20.56, 28.30 and 19.42 is: 26.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.56 : 28.30 = 19.42 : x
  2. Step 2: Convert to fraction form
    20.56/28.30 = 19.42/x
  3. Step 3: Cross multiply
    20.56x = 28.30 × 19.42
  4. Step 4: Simplify right side
    20.56x = 549.59
  5. Step 5: Solve for x
    x = 549.59/20.56
  6. Step 6: Final answer
    x = 26.73

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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.