Home / 87,429.40-131,144.10-80,139.40

Finding the Fourth Proportional to 87,429.40, 131,144.10 and 80,139.40

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Solution

The fourth proportional to 87,429.40, 131,144.10 and 80,139.40 is: 120,209.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,429.40 : 131,144.10 = 80,139.40 : x
  2. Step 2: Convert to fraction form
    87,429.40/131,144.10 = 80,139.40/x
  3. Step 3: Cross multiply
    87,429.40x = 131,144.10 × 80,139.40
  4. Step 4: Simplify right side
    87,429.40x = 10,509,809,487.54
  5. Step 5: Solve for x
    x = 10,509,809,487.54/87,429.40
  6. Step 6: Final answer
    x = 120,209.10

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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.