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Finding the Fourth Proportional to 140.56, 209.33 and 138.10

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Solution

The fourth proportional to 140.56, 209.33 and 138.10 is: 205.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.56 : 209.33 = 138.10 : x
  2. Step 2: Convert to fraction form
    140.56/209.33 = 138.10/x
  3. Step 3: Cross multiply
    140.56x = 209.33 × 138.10
  4. Step 4: Simplify right side
    140.56x = 28,908.47
  5. Step 5: Solve for x
    x = 28,908.47/140.56
  6. Step 6: Final answer
    x = 205.67

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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.