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Finding the Fourth Proportional to 20.96, 28.96 and 18.37

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Solution

The fourth proportional to 20.96, 28.96 and 18.37 is: 25.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.96 : 28.96 = 18.37 : x
  2. Step 2: Convert to fraction form
    20.96/28.96 = 18.37/x
  3. Step 3: Cross multiply
    20.96x = 28.96 × 18.37
  4. Step 4: Simplify right side
    20.96x = 531.93
  5. Step 5: Solve for x
    x = 531.93/20.96
  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.