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Finding the Fourth Proportional to 20.71, 28.55 and 18.41

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Solution

The fourth proportional to 20.71, 28.55 and 18.41 is: 25.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.71 : 28.55 = 18.41 : x
  2. Step 2: Convert to fraction form
    20.71/28.55 = 18.41/x
  3. Step 3: Cross multiply
    20.71x = 28.55 × 18.41
  4. Step 4: Simplify right side
    20.71x = 525.61
  5. Step 5: Solve for x
    x = 525.61/20.71
  6. Step 6: Final answer
    x = 25.38

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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.