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Finding the Fourth Proportional to 140.28, 209.05 and 138.91

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Solution

The fourth proportional to 140.28, 209.05 and 138.91 is: 207.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.28 : 209.05 = 138.91 : x
  2. Step 2: Convert to fraction form
    140.28/209.05 = 138.91/x
  3. Step 3: Cross multiply
    140.28x = 209.05 × 138.91
  4. Step 4: Simplify right side
    140.28x = 29,039.66
  5. Step 5: Solve for x
    x = 29,039.66/140.28
  6. Step 6: Final answer
    x = 207.01

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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.