Home / 1,426.10-2,139.28-386.11

Finding the Fourth Proportional to 1,426.10, 2,139.28 and 386.11

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Solution

The fourth proportional to 1,426.10, 2,139.28 and 386.11 is: 579.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,426.10 : 2,139.28 = 386.11 : x
  2. Step 2: Convert to fraction form
    1,426.10/2,139.28 = 386.11/x
  3. Step 3: Cross multiply
    1,426.10x = 2,139.28 × 386.11
  4. Step 4: Simplify right side
    1,426.10x = 825,997.40
  5. Step 5: Solve for x
    x = 825,997.40/1,426.10
  6. Step 6: Final answer
    x = 579.20

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Double scale
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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.