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Finding the Fourth Proportional to 139,639.20, 209,458.80 and 136,358.70

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Solution

The fourth proportional to 139,639.20, 209,458.80 and 136,358.70 is: 204,538.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,639.20 : 209,458.80 = 136,358.70 : x
  2. Step 2: Convert to fraction form
    139,639.20/209,458.80 = 136,358.70/x
  3. Step 3: Cross multiply
    139,639.20x = 209,458.80 × 136,358.70
  4. Step 4: Simplify right side
    139,639.20x = 28,561,529,671.56
  5. Step 5: Solve for x
    x = 28,561,529,671.56/139,639.20
  6. Step 6: Final answer
    x = 204,538.05

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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.