Home / 3,921.45-5,411.57-2,128.89

Finding the Fourth Proportional to 3,921.45, 5,411.57 and 2,128.89

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Solution

The fourth proportional to 3,921.45, 5,411.57 and 2,128.89 is: 2,937.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,921.45 : 5,411.57 = 2,128.89 : x
  2. Step 2: Convert to fraction form
    3,921.45/5,411.57 = 2,128.89/x
  3. Step 3: Cross multiply
    3,921.45x = 5,411.57 × 2,128.89
  4. Step 4: Simplify right side
    3,921.45x = 11,520,637.26
  5. Step 5: Solve for x
    x = 11,520,637.26/3,921.45
  6. Step 6: Final answer
    x = 2,937.85

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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.