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Finding the Fourth Proportional to 141.38, 211.78 and 68.15

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Solution

The fourth proportional to 141.38, 211.78 and 68.15 is: 102.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.38 : 211.78 = 68.15 : x
  2. Step 2: Convert to fraction form
    141.38/211.78 = 68.15/x
  3. Step 3: Cross multiply
    141.38x = 211.78 × 68.15
  4. Step 4: Simplify right side
    141.38x = 14,433.42
  5. Step 5: Solve for x
    x = 14,433.42/141.38
  6. Step 6: Final answer
    x = 102.09

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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.