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Finding the Fourth Proportional to 140.51, 211.92 and 138.97

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Solution

The fourth proportional to 140.51, 211.92 and 138.97 is: 209.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.51 : 211.92 = 138.97 : x
  2. Step 2: Convert to fraction form
    140.51/211.92 = 138.97/x
  3. Step 3: Cross multiply
    140.51x = 211.92 × 138.97
  4. Step 4: Simplify right side
    140.51x = 29,450.52
  5. Step 5: Solve for x
    x = 29,450.52/140.51
  6. Step 6: Final answer
    x = 209.60

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.