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Finding the Fourth Proportional to 140.49, 192.80 and 138.09

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Solution

The fourth proportional to 140.49, 192.80 and 138.09 is: 189.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.49 : 192.80 = 138.09 : x
  2. Step 2: Convert to fraction form
    140.49/192.80 = 138.09/x
  3. Step 3: Cross multiply
    140.49x = 192.80 × 138.09
  4. Step 4: Simplify right side
    140.49x = 26,624.10
  5. Step 5: Solve for x
    x = 26,624.10/140.49
  6. Step 6: Final answer
    x = 189.51

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.