Home / 1,725.28-2,380.78-939.30

Finding the Fourth Proportional to 1,725.28, 2,380.78 and 939.30

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Solution

The fourth proportional to 1,725.28, 2,380.78 and 939.30 is: 1,296.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,725.28 : 2,380.78 = 939.30 : x
  2. Step 2: Convert to fraction form
    1,725.28/2,380.78 = 939.30/x
  3. Step 3: Cross multiply
    1,725.28x = 2,380.78 × 939.30
  4. Step 4: Simplify right side
    1,725.28x = 2,236,266.65
  5. Step 5: Solve for x
    x = 2,236,266.65/1,725.28
  6. Step 6: Final answer
    x = 1,296.18

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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.