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Finding the Fourth Proportional to 290,981.76, 436,424.04 and 80,640.96

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Solution

The fourth proportional to 290,981.76, 436,424.04 and 80,640.96 is: 120,947.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,981.76 : 436,424.04 = 80,640.96 : x
  2. Step 2: Convert to fraction form
    290,981.76/436,424.04 = 80,640.96/x
  3. Step 3: Cross multiply
    290,981.76x = 436,424.04 × 80,640.96
  4. Step 4: Simplify right side
    290,981.76x = 35,193,653,552.68
  5. Step 5: Solve for x
    x = 35,193,653,552.68/290,981.76
  6. Step 6: Final answer
    x = 120,947.97

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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.