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Finding the Fourth Proportional to 139,819.80, 209,729.70 and 76,834.20

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Solution

The fourth proportional to 139,819.80, 209,729.70 and 76,834.20 is: 115,251.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,819.80 : 209,729.70 = 76,834.20 : x
  2. Step 2: Convert to fraction form
    139,819.80/209,729.70 = 76,834.20/x
  3. Step 3: Cross multiply
    139,819.80x = 209,729.70 × 76,834.20
  4. Step 4: Simplify right side
    139,819.80x = 16,114,413,715.74
  5. Step 5: Solve for x
    x = 16,114,413,715.74/139,819.80
  6. Step 6: Final answer
    x = 115,251.30

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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.