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Finding the Fourth Proportional to 139.56, 209.64 and 133.92

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Solution

The fourth proportional to 139.56, 209.64 and 133.92 is: 201.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.56 : 209.64 = 133.92 : x
  2. Step 2: Convert to fraction form
    139.56/209.64 = 133.92/x
  3. Step 3: Cross multiply
    139.56x = 209.64 × 133.92
  4. Step 4: Simplify right side
    139.56x = 28,074.99
  5. Step 5: Solve for x
    x = 28,074.99/139.56
  6. Step 6: Final answer
    x = 201.17

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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.