Home / 109,511.20-164,439.60-80,135.20

Finding the Fourth Proportional to 109,511.20, 164,439.60 and 80,135.20

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Solution

The fourth proportional to 109,511.20, 164,439.60 and 80,135.20 is: 120,329.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,511.20 : 164,439.60 = 80,135.20 : x
  2. Step 2: Convert to fraction form
    109,511.20/164,439.60 = 80,135.20/x
  3. Step 3: Cross multiply
    109,511.20x = 164,439.60 × 80,135.20
  4. Step 4: Simplify right side
    109,511.20x = 13,177,400,233.92
  5. Step 5: Solve for x
    x = 13,177,400,233.92/109,511.20
  6. Step 6: Final answer
    x = 120,329.25

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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.