Home / 80,486.30-120,724.05-21,320.70

Finding the Fourth Proportional to 80,486.30, 120,724.05 and 21,320.70

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Solution

The fourth proportional to 80,486.30, 120,724.05 and 21,320.70 is: 31,979.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,486.30 : 120,724.05 = 21,320.70 : x
  2. Step 2: Convert to fraction form
    80,486.30/120,724.05 = 21,320.70/x
  3. Step 3: Cross multiply
    80,486.30x = 120,724.05 × 21,320.70
  4. Step 4: Simplify right side
    80,486.30x = 2,573,921,252.84
  5. Step 5: Solve for x
    x = 2,573,921,252.84/80,486.30
  6. Step 6: Final answer
    x = 31,979.62

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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.