Home / 2,921.88-4,378.98-1,189.56

Finding the Fourth Proportional to 2,921.88, 4,378.98 and 1,189.56

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Solution

The fourth proportional to 2,921.88, 4,378.98 and 1,189.56 is: 1,782.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,921.88 : 4,378.98 = 1,189.56 : x
  2. Step 2: Convert to fraction form
    2,921.88/4,378.98 = 1,189.56/x
  3. Step 3: Cross multiply
    2,921.88x = 4,378.98 × 1,189.56
  4. Step 4: Simplify right side
    2,921.88x = 5,209,059.45
  5. Step 5: Solve for x
    x = 5,209,059.45/2,921.88
  6. Step 6: Final answer
    x = 1,782.78

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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.