Home / 1,426.12-2,138.86-386.22

Finding the Fourth Proportional to 1,426.12, 2,138.86 and 386.22

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Solution

The fourth proportional to 1,426.12, 2,138.86 and 386.22 is: 579.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,426.12 : 2,138.86 = 386.22 : x
  2. Step 2: Convert to fraction form
    1,426.12/2,138.86 = 386.22/x
  3. Step 3: Cross multiply
    1,426.12x = 2,138.86 × 386.22
  4. Step 4: Simplify right side
    1,426.12x = 826,062.97
  5. Step 5: Solve for x
    x = 826,062.97/1,426.12
  6. Step 6: Final answer
    x = 579.24

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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.