Home / 3,921.03-5,411.07-2,128.55

Finding the Fourth Proportional to 3,921.03, 5,411.07 and 2,128.55

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Solution

The fourth proportional to 3,921.03, 5,411.07 and 2,128.55 is: 2,937.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,921.03 : 5,411.07 = 2,128.55 : x
  2. Step 2: Convert to fraction form
    3,921.03/5,411.07 = 2,128.55/x
  3. Step 3: Cross multiply
    3,921.03x = 5,411.07 × 2,128.55
  4. Step 4: Simplify right side
    3,921.03x = 11,517,705.99
  5. Step 5: Solve for x
    x = 11,517,705.99/3,921.03
  6. Step 6: Final answer
    x = 2,937.42

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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.