Home / 2,780.87-4,172.09-1,392.53

Finding the Fourth Proportional to 2,780.87, 4,172.09 and 1,392.53

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Solution

The fourth proportional to 2,780.87, 4,172.09 and 1,392.53 is: 2,089.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,780.87 : 4,172.09 = 1,392.53 : x
  2. Step 2: Convert to fraction form
    2,780.87/4,172.09 = 1,392.53/x
  3. Step 3: Cross multiply
    2,780.87x = 4,172.09 × 1,392.53
  4. Step 4: Simplify right side
    2,780.87x = 5,809,732.66
  5. Step 5: Solve for x
    x = 5,809,732.66/2,780.87
  6. Step 6: Final answer
    x = 2,089.18

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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.