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Finding the Fourth Proportional to 139,819.20, 209,728.80 and 135,931.20

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Solution

The fourth proportional to 139,819.20, 209,728.80 and 135,931.20 is: 203,896.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,819.20 : 209,728.80 = 135,931.20 : x
  2. Step 2: Convert to fraction form
    139,819.20/209,728.80 = 135,931.20/x
  3. Step 3: Cross multiply
    139,819.20x = 209,728.80 × 135,931.20
  4. Step 4: Simplify right side
    139,819.20x = 28,508,687,458.56
  5. Step 5: Solve for x
    x = 28,508,687,458.56/139,819.20
  6. Step 6: Final answer
    x = 203,896.80

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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.