Home / 1,725.10-2,380.79-979.09

Finding the Fourth Proportional to 1,725.10, 2,380.79 and 979.09

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Solution

The fourth proportional to 1,725.10, 2,380.79 and 979.09 is: 1,351.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,725.10 : 2,380.79 = 979.09 : x
  2. Step 2: Convert to fraction form
    1,725.10/2,380.79 = 979.09/x
  3. Step 3: Cross multiply
    1,725.10x = 2,380.79 × 979.09
  4. Step 4: Simplify right side
    1,725.10x = 2,331,004.18
  5. Step 5: Solve for x
    x = 2,331,004.18/1,725.10
  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.