Home / 3,921.14-5,411.15-2,128.58

Finding the Fourth Proportional to 3,921.14, 5,411.15 and 2,128.58

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Solution

The fourth proportional to 3,921.14, 5,411.15 and 2,128.58 is: 2,937.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,921.14 : 5,411.15 = 2,128.58 : x
  2. Step 2: Convert to fraction form
    3,921.14/5,411.15 = 2,128.58/x
  3. Step 3: Cross multiply
    3,921.14x = 5,411.15 × 2,128.58
  4. Step 4: Simplify right side
    3,921.14x = 11,518,065.67
  5. Step 5: Solve for x
    x = 11,518,065.67/3,921.14
  6. Step 6: Final answer
    x = 2,937.43

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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.