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Finding the Fourth Proportional to 141.38, 212.07 and 45.20

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Solution

The fourth proportional to 141.38, 212.07 and 45.20 is: 67.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.38 : 212.07 = 45.20 : x
  2. Step 2: Convert to fraction form
    141.38/212.07 = 45.20/x
  3. Step 3: Cross multiply
    141.38x = 212.07 × 45.20
  4. Step 4: Simplify right side
    141.38x = 9,584.50
  5. Step 5: Solve for x
    x = 9,584.50/141.38
  6. Step 6: Final answer
    x = 67.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.