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Finding the Fourth Proportional to 36.39, 54.20 and 35.78

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Solution

The fourth proportional to 36.39, 54.20 and 35.78 is: 53.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    36.39 : 54.20 = 35.78 : x
  2. Step 2: Convert to fraction form
    36.39/54.20 = 35.78/x
  3. Step 3: Cross multiply
    36.39x = 54.20 × 35.78
  4. Step 4: Simplify right side
    36.39x = 1,938.83
  5. Step 5: Solve for x
    x = 1,938.83/36.39
  6. Step 6: Final answer
    x = 53.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.