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Finding the Fourth Proportional to 3,391.28, 4,679.78 and 1,974.90

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Solution

The fourth proportional to 3,391.28, 4,679.78 and 1,974.90 is: 2,725.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,391.28 : 4,679.78 = 1,974.90 : x
  2. Step 2: Convert to fraction form
    3,391.28/4,679.78 = 1,974.90/x
  3. Step 3: Cross multiply
    3,391.28x = 4,679.78 × 1,974.90
  4. Step 4: Simplify right side
    3,391.28x = 9,242,097.52
  5. Step 5: Solve for x
    x = 9,242,097.52/3,391.28
  6. Step 6: Final answer
    x = 2,725.25

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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.