Home / 3,721.12-5,135.20-2,128.10

Finding the Fourth Proportional to 3,721.12, 5,135.20 and 2,128.10

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Solution

The fourth proportional to 3,721.12, 5,135.20 and 2,128.10 is: 2,936.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,721.12 : 5,135.20 = 2,128.10 : x
  2. Step 2: Convert to fraction form
    3,721.12/5,135.20 = 2,128.10/x
  3. Step 3: Cross multiply
    3,721.12x = 5,135.20 × 2,128.10
  4. Step 4: Simplify right side
    3,721.12x = 10,928,219.12
  5. Step 5: Solve for x
    x = 10,928,219.12/3,721.12
  6. Step 6: Final answer
    x = 2,936.81

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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.