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Finding the Fourth Proportional to 36.42, 50.24 and 20.87

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Solution

The fourth proportional to 36.42, 50.24 and 20.87 is: 28.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    36.42 : 50.24 = 20.87 : x
  2. Step 2: Convert to fraction form
    36.42/50.24 = 20.87/x
  3. Step 3: Cross multiply
    36.42x = 50.24 × 20.87
  4. Step 4: Simplify right side
    36.42x = 1,048.71
  5. Step 5: Solve for x
    x = 1,048.71/36.42
  6. Step 6: Final answer
    x = 28.80

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.