Home / 1,272.12-1,759.38-1,139.12

Finding the Fourth Proportional to 1,272.12, 1,759.38 and 1,139.12

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Solution

The fourth proportional to 1,272.12, 1,759.38 and 1,139.12 is: 1,575.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.12 : 1,759.38 = 1,139.12 : x
  2. Step 2: Convert to fraction form
    1,272.12/1,759.38 = 1,139.12/x
  3. Step 3: Cross multiply
    1,272.12x = 1,759.38 × 1,139.12
  4. Step 4: Simplify right side
    1,272.12x = 2,004,136.15
  5. Step 5: Solve for x
    x = 2,004,136.15/1,272.12
  6. Step 6: Final answer
    x = 1,575.43

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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.