Home / 1,426.35-2,139.33-386.40

Finding the Fourth Proportional to 1,426.35, 2,139.33 and 386.40

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Solution

The fourth proportional to 1,426.35, 2,139.33 and 386.40 is: 579.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,426.35 : 2,139.33 = 386.40 : x
  2. Step 2: Convert to fraction form
    1,426.35/2,139.33 = 386.40/x
  3. Step 3: Cross multiply
    1,426.35x = 2,139.33 × 386.40
  4. Step 4: Simplify right side
    1,426.35x = 826,637.11
  5. Step 5: Solve for x
    x = 826,637.11/1,426.35
  6. Step 6: Final answer
    x = 579.55

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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.