Home / 1,422.09-2,132.19-691.25

Finding the Fourth Proportional to 1,422.09, 2,132.19 and 691.25

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Solution

The fourth proportional to 1,422.09, 2,132.19 and 691.25 is: 1,036.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,422.09 : 2,132.19 = 691.25 : x
  2. Step 2: Convert to fraction form
    1,422.09/2,132.19 = 691.25/x
  3. Step 3: Cross multiply
    1,422.09x = 2,132.19 × 691.25
  4. Step 4: Simplify right side
    1,422.09x = 1,473,865.68
  5. Step 5: Solve for x
    x = 1,473,865.68/1,422.09
  6. Step 6: Final answer
    x = 1,036.41

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1.5x scale

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.