Home / 1,720.15-2,578.20-1,286.80

Finding the Fourth Proportional to 1,720.15, 2,578.20 and 1,286.80

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Solution

The fourth proportional to 1,720.15, 2,578.20 and 1,286.80 is: 1,928.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,720.15 : 2,578.20 = 1,286.80 : x
  2. Step 2: Convert to fraction form
    1,720.15/2,578.20 = 1,286.80/x
  3. Step 3: Cross multiply
    1,720.15x = 2,578.20 × 1,286.80
  4. Step 4: Simplify right side
    1,720.15x = 3,317,627.76
  5. Step 5: Solve for x
    x = 3,317,627.76/1,720.15
  6. Step 6: Final answer
    x = 1,928.69

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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.