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Finding the Fourth Proportional to 139.60, 209.49 and 103.63

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Solution

The fourth proportional to 139.60, 209.49 and 103.63 is: 155.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.60 : 209.49 = 103.63 : x
  2. Step 2: Convert to fraction form
    139.60/209.49 = 103.63/x
  3. Step 3: Cross multiply
    139.60x = 209.49 × 103.63
  4. Step 4: Simplify right side
    139.60x = 21,709.45
  5. Step 5: Solve for x
    x = 21,709.45/139.60
  6. Step 6: Final answer
    x = 155.51

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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.