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Finding the Fourth Proportional to 141.72, 212.54 and 68.55

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Solution

The fourth proportional to 141.72, 212.54 and 68.55 is: 102.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.72 : 212.54 = 68.55 : x
  2. Step 2: Convert to fraction form
    141.72/212.54 = 68.55/x
  3. Step 3: Cross multiply
    141.72x = 212.54 × 68.55
  4. Step 4: Simplify right side
    141.72x = 14,569.62
  5. Step 5: Solve for x
    x = 14,569.62/141.72
  6. Step 6: Final answer
    x = 102.81

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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.