Home / 280,949.40-421,371.78-81,220.38

Finding the Fourth Proportional to 280,949.40, 421,371.78 and 81,220.38

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Solution

The fourth proportional to 280,949.40, 421,371.78 and 81,220.38 is: 121,815.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,949.40 : 421,371.78 = 81,220.38 : x
  2. Step 2: Convert to fraction form
    280,949.40/421,371.78 = 81,220.38/x
  3. Step 3: Cross multiply
    280,949.40x = 421,371.78 × 81,220.38
  4. Step 4: Simplify right side
    280,949.40x = 34,223,976,092.88
  5. Step 5: Solve for x
    x = 34,223,976,092.88/280,949.40
  6. Step 6: Final answer
    x = 121,815.44

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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.