Home / 2,189.12-3,021.60-1,257.92

Finding the Fourth Proportional to 2,189.12, 3,021.60 and 1,257.92

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Solution

The fourth proportional to 2,189.12, 3,021.60 and 1,257.92 is: 1,736.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,189.12 : 3,021.60 = 1,257.92 : x
  2. Step 2: Convert to fraction form
    2,189.12/3,021.60 = 1,257.92/x
  3. Step 3: Cross multiply
    2,189.12x = 3,021.60 × 1,257.92
  4. Step 4: Simplify right side
    2,189.12x = 3,800,931.07
  5. Step 5: Solve for x
    x = 3,800,931.07/2,189.12
  6. Step 6: Final answer
    x = 1,736.28

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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.