Home / 80,686.12-120,990.78-28,089.16

Finding the Fourth Proportional to 80,686.12, 120,990.78 and 28,089.16

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Solution

The fourth proportional to 80,686.12, 120,990.78 and 28,089.16 is: 42,120.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,686.12 : 120,990.78 = 28,089.16 : x
  2. Step 2: Convert to fraction form
    80,686.12/120,990.78 = 28,089.16/x
  3. Step 3: Cross multiply
    80,686.12x = 120,990.78 × 28,089.16
  4. Step 4: Simplify right side
    80,686.12x = 3,398,529,377.94
  5. Step 5: Solve for x
    x = 3,398,529,377.94/80,686.12
  6. Step 6: Final answer
    x = 42,120.37

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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.