Home / 1,286.10-1,774.14-991.26

Finding the Fourth Proportional to 1,286.10, 1,774.14 and 991.26

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Solution

The fourth proportional to 1,286.10, 1,774.14 and 991.26 is: 1,367.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.10 : 1,774.14 = 991.26 : x
  2. Step 2: Convert to fraction form
    1,286.10/1,774.14 = 991.26/x
  3. Step 3: Cross multiply
    1,286.10x = 1,774.14 × 991.26
  4. Step 4: Simplify right side
    1,286.10x = 1,758,634.02
  5. Step 5: Solve for x
    x = 1,758,634.02/1,286.10
  6. Step 6: Final answer
    x = 1,367.42

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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.