Home / 2,780.75-4,169.90-1,320.32

Finding the Fourth Proportional to 2,780.75, 4,169.90 and 1,320.32

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Solution

The fourth proportional to 2,780.75, 4,169.90 and 1,320.32 is: 1,979.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,780.75 : 4,169.90 = 1,320.32 : x
  2. Step 2: Convert to fraction form
    2,780.75/4,169.90 = 1,320.32/x
  3. Step 3: Cross multiply
    2,780.75x = 4,169.90 × 1,320.32
  4. Step 4: Simplify right side
    2,780.75x = 5,505,584.82
  5. Step 5: Solve for x
    x = 5,505,584.82/2,780.75
  6. Step 6: Final answer
    x = 1,979.90

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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.