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Finding the Fourth Proportional to 1,806.15, 2,709.22 and 489.91

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Solution

The fourth proportional to 1,806.15, 2,709.22 and 489.91 is: 734.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,806.15 : 2,709.22 = 489.91 : x
  2. Step 2: Convert to fraction form
    1,806.15/2,709.22 = 489.91/x
  3. Step 3: Cross multiply
    1,806.15x = 2,709.22 × 489.91
  4. Step 4: Simplify right side
    1,806.15x = 1,327,265.73
  5. Step 5: Solve for x
    x = 1,327,265.73/1,806.15
  6. Step 6: Final answer
    x = 734.86

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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.