Home / 2,121.78-2,928.30-1,190.46

Finding the Fourth Proportional to 2,121.78, 2,928.30 and 1,190.46

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Solution

The fourth proportional to 2,121.78, 2,928.30 and 1,190.46 is: 1,642.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.78 : 2,928.30 = 1,190.46 : x
  2. Step 2: Convert to fraction form
    2,121.78/2,928.30 = 1,190.46/x
  3. Step 3: Cross multiply
    2,121.78x = 2,928.30 × 1,190.46
  4. Step 4: Simplify right side
    2,121.78x = 3,486,024.02
  5. Step 5: Solve for x
    x = 3,486,024.02/2,121.78
  6. Step 6: Final answer
    x = 1,642.97

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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.