Home / 280,117.39-420,112.09-80,436.19

Finding the Fourth Proportional to 280,117.39, 420,112.09 and 80,436.19

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Solution

The fourth proportional to 280,117.39, 420,112.09 and 80,436.19 is: 120,635.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,117.39 : 420,112.09 = 80,436.19 : x
  2. Step 2: Convert to fraction form
    280,117.39/420,112.09 = 80,436.19/x
  3. Step 3: Cross multiply
    280,117.39x = 420,112.09 × 80,436.19
  4. Step 4: Simplify right side
    280,117.39x = 33,792,215,892.54
  5. Step 5: Solve for x
    x = 33,792,215,892.54/280,117.39
  6. Step 6: Final answer
    x = 120,635.91

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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.