Home / 1,725.20-2,380.86-979.12

Finding the Fourth Proportional to 1,725.20, 2,380.86 and 979.12

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Solution

The fourth proportional to 1,725.20, 2,380.86 and 979.12 is: 1,351.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,725.20 : 2,380.86 = 979.12 : x
  2. Step 2: Convert to fraction form
    1,725.20/2,380.86 = 979.12/x
  3. Step 3: Cross multiply
    1,725.20x = 2,380.86 × 979.12
  4. Step 4: Simplify right side
    1,725.20x = 2,331,147.64
  5. Step 5: Solve for x
    x = 2,331,147.64/1,725.20
  6. Step 6: Final answer
    x = 1,351.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.