Home / 80,571.20-120,856.50-19,781.72

Finding the Fourth Proportional to 80,571.20, 120,856.50 and 19,781.72

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Solution

The fourth proportional to 80,571.20, 120,856.50 and 19,781.72 is: 29,672.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,571.20 : 120,856.50 = 19,781.72 : x
  2. Step 2: Convert to fraction form
    80,571.20/120,856.50 = 19,781.72/x
  3. Step 3: Cross multiply
    80,571.20x = 120,856.50 × 19,781.72
  4. Step 4: Simplify right side
    80,571.20x = 2,390,749,443.18
  5. Step 5: Solve for x
    x = 2,390,749,443.18/80,571.20
  6. Step 6: Final answer
    x = 29,672.51

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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.