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Finding the Fourth Proportional to 140.07, 209.79 and 109.20

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Solution

The fourth proportional to 140.07, 209.79 and 109.20 is: 163.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.07 : 209.79 = 109.20 : x
  2. Step 2: Convert to fraction form
    140.07/209.79 = 109.20/x
  3. Step 3: Cross multiply
    140.07x = 209.79 × 109.20
  4. Step 4: Simplify right side
    140.07x = 22,909.07
  5. Step 5: Solve for x
    x = 22,909.07/140.07
  6. Step 6: Final answer
    x = 163.55

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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.