Home / 1,287.26-1,919.59-1,275.57

Finding the Fourth Proportional to 1,287.26, 1,919.59 and 1,275.57

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Solution

The fourth proportional to 1,287.26, 1,919.59 and 1,275.57 is: 1,902.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.26 : 1,919.59 = 1,275.57 : x
  2. Step 2: Convert to fraction form
    1,287.26/1,919.59 = 1,275.57/x
  3. Step 3: Cross multiply
    1,287.26x = 1,919.59 × 1,275.57
  4. Step 4: Simplify right side
    1,287.26x = 2,448,571.42
  5. Step 5: Solve for x
    x = 2,448,571.42/1,287.26
  6. Step 6: Final answer
    x = 1,902.16

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.