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Finding the Fourth Proportional to 1,788.19, 2,682.19 and 489.65

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Solution

The fourth proportional to 1,788.19, 2,682.19 and 489.65 is: 734.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,788.19 : 2,682.19 = 489.65 : x
  2. Step 2: Convert to fraction form
    1,788.19/2,682.19 = 489.65/x
  3. Step 3: Cross multiply
    1,788.19x = 2,682.19 × 489.65
  4. Step 4: Simplify right side
    1,788.19x = 1,313,334.33
  5. Step 5: Solve for x
    x = 1,313,334.33/1,788.19
  6. Step 6: Final answer
    x = 734.45

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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.