Home / 2,580.40-3,872.40-1,120.60

Finding the Fourth Proportional to 2,580.40, 3,872.40 and 1,120.60

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Solution

The fourth proportional to 2,580.40, 3,872.40 and 1,120.60 is: 1,681.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,580.40 : 3,872.40 = 1,120.60 : x
  2. Step 2: Convert to fraction form
    2,580.40/3,872.40 = 1,120.60/x
  3. Step 3: Cross multiply
    2,580.40x = 3,872.40 × 1,120.60
  4. Step 4: Simplify right side
    2,580.40x = 4,339,411.44
  5. Step 5: Solve for x
    x = 4,339,411.44/2,580.40
  6. Step 6: Final answer
    x = 1,681.68

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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.