Home / 1,387.60-2,081.40-1,260.03

Finding the Fourth Proportional to 1,387.60, 2,081.40 and 1,260.03

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Solution

The fourth proportional to 1,387.60, 2,081.40 and 1,260.03 is: 1,890.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.60 : 2,081.40 = 1,260.03 : x
  2. Step 2: Convert to fraction form
    1,387.60/2,081.40 = 1,260.03/x
  3. Step 3: Cross multiply
    1,387.60x = 2,081.40 × 1,260.03
  4. Step 4: Simplify right side
    1,387.60x = 2,622,626.44
  5. Step 5: Solve for x
    x = 2,622,626.44/1,387.60
  6. Step 6: Final answer
    x = 1,890.05

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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.