Home / 1,322.20-1,979.65-669.75

Finding the Fourth Proportional to 1,322.20, 1,979.65 and 669.75

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Solution

The fourth proportional to 1,322.20, 1,979.65 and 669.75 is: 1,002.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,322.20 : 1,979.65 = 669.75 : x
  2. Step 2: Convert to fraction form
    1,322.20/1,979.65 = 669.75/x
  3. Step 3: Cross multiply
    1,322.20x = 1,979.65 × 669.75
  4. Step 4: Simplify right side
    1,322.20x = 1,325,870.59
  5. Step 5: Solve for x
    x = 1,325,870.59/1,322.20
  6. Step 6: Final answer
    x = 1,002.78

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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.