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Finding the Fourth Proportional to 218.38, 301.43 and 140.75

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Solution

The fourth proportional to 218.38, 301.43 and 140.75 is: 194.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.38 : 301.43 = 140.75 : x
  2. Step 2: Convert to fraction form
    218.38/301.43 = 140.75/x
  3. Step 3: Cross multiply
    218.38x = 301.43 × 140.75
  4. Step 4: Simplify right side
    218.38x = 42,425.57
  5. Step 5: Solve for x
    x = 42,425.57/218.38
  6. Step 6: Final answer
    x = 194.28

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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.