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Finding the Fourth Proportional to 141.25, 211.49 and 72.75

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Solution

The fourth proportional to 141.25, 211.49 and 72.75 is: 108.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.25 : 211.49 = 72.75 : x
  2. Step 2: Convert to fraction form
    141.25/211.49 = 72.75/x
  3. Step 3: Cross multiply
    141.25x = 211.49 × 72.75
  4. Step 4: Simplify right side
    141.25x = 15,385.53
  5. Step 5: Solve for x
    x = 15,385.53/141.25
  6. Step 6: Final answer
    x = 108.93

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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.