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Finding the Fourth Proportional to 140.70, 209.97 and 120.45

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Solution

The fourth proportional to 140.70, 209.97 and 120.45 is: 179.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.70 : 209.97 = 120.45 : x
  2. Step 2: Convert to fraction form
    140.70/209.97 = 120.45/x
  3. Step 3: Cross multiply
    140.70x = 209.97 × 120.45
  4. Step 4: Simplify right side
    140.70x = 25,290.89
  5. Step 5: Solve for x
    x = 25,290.89/140.70
  6. Step 6: Final answer
    x = 179.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.