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Finding the Fourth Proportional to 140.75, 211.36 and 138.59

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Solution

The fourth proportional to 140.75, 211.36 and 138.59 is: 208.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.75 : 211.36 = 138.59 : x
  2. Step 2: Convert to fraction form
    140.75/211.36 = 138.59/x
  3. Step 3: Cross multiply
    140.75x = 211.36 × 138.59
  4. Step 4: Simplify right side
    140.75x = 29,292.38
  5. Step 5: Solve for x
    x = 29,292.38/140.75
  6. Step 6: Final answer
    x = 208.12

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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.