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Finding the Fourth Proportional to 139,260.80, 208,891.20 and 80,278.40

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Solution

The fourth proportional to 139,260.80, 208,891.20 and 80,278.40 is: 120,417.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,260.80 : 208,891.20 = 80,278.40 : x
  2. Step 2: Convert to fraction form
    139,260.80/208,891.20 = 80,278.40/x
  3. Step 3: Cross multiply
    139,260.80x = 208,891.20 × 80,278.40
  4. Step 4: Simplify right side
    139,260.80x = 16,769,451,310.08
  5. Step 5: Solve for x
    x = 16,769,451,310.08/139,260.80
  6. Step 6: Final answer
    x = 120,417.60

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1.5x scale

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.