Home / 1,399.28-2,099.04-669.20

Finding the Fourth Proportional to 1,399.28, 2,099.04 and 669.20

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Solution

The fourth proportional to 1,399.28, 2,099.04 and 669.20 is: 1,003.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399.28 : 2,099.04 = 669.20 : x
  2. Step 2: Convert to fraction form
    1,399.28/2,099.04 = 669.20/x
  3. Step 3: Cross multiply
    1,399.28x = 2,099.04 × 669.20
  4. Step 4: Simplify right side
    1,399.28x = 1,404,677.57
  5. Step 5: Solve for x
    x = 1,404,677.57/1,399.28
  6. Step 6: Final answer
    x = 1,003.86

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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.