Home / 3,921.10-5,411.12-2,128.58

Finding the Fourth Proportional to 3,921.10, 5,411.12 and 2,128.58

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Solution

The fourth proportional to 3,921.10, 5,411.12 and 2,128.58 is: 2,937.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,921.10 : 5,411.12 = 2,128.58 : x
  2. Step 2: Convert to fraction form
    3,921.10/5,411.12 = 2,128.58/x
  3. Step 3: Cross multiply
    3,921.10x = 5,411.12 × 2,128.58
  4. Step 4: Simplify right side
    3,921.10x = 11,517,980.08
  5. Step 5: Solve for x
    x = 11,517,980.08/3,921.10
  6. Step 6: Final answer
    x = 2,937.44

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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.