Home / 1,378.26-1,902.30-1,078.92

Finding the Fourth Proportional to 1,378.26, 1,902.30 and 1,078.92

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Solution

The fourth proportional to 1,378.26, 1,902.30 and 1,078.92 is: 1,489.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.26 : 1,902.30 = 1,078.92 : x
  2. Step 2: Convert to fraction form
    1,378.26/1,902.30 = 1,078.92/x
  3. Step 3: Cross multiply
    1,378.26x = 1,902.30 × 1,078.92
  4. Step 4: Simplify right side
    1,378.26x = 2,052,429.52
  5. Step 5: Solve for x
    x = 2,052,429.52/1,378.26
  6. Step 6: Final answer
    x = 1,489.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.