Home / 1,788.40-2,682.60-489.86

Finding the Fourth Proportional to 1,788.40, 2,682.60 and 489.86

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Solution

The fourth proportional to 1,788.40, 2,682.60 and 489.86 is: 734.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,788.40 : 2,682.60 = 489.86 : x
  2. Step 2: Convert to fraction form
    1,788.40/2,682.60 = 489.86/x
  3. Step 3: Cross multiply
    1,788.40x = 2,682.60 × 489.86
  4. Step 4: Simplify right side
    1,788.40x = 1,314,098.44
  5. Step 5: Solve for x
    x = 1,314,098.44/1,788.40
  6. Step 6: Final answer
    x = 734.79

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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.