Home / 3,921.13-5,411.14-2,128.65

Finding the Fourth Proportional to 3,921.13, 5,411.14 and 2,128.65

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Solution

The fourth proportional to 3,921.13, 5,411.14 and 2,128.65 is: 2,937.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,921.13 : 5,411.14 = 2,128.65 : x
  2. Step 2: Convert to fraction form
    3,921.13/5,411.14 = 2,128.65/x
  3. Step 3: Cross multiply
    3,921.13x = 5,411.14 × 2,128.65
  4. Step 4: Simplify right side
    3,921.13x = 11,518,390.78
  5. Step 5: Solve for x
    x = 11,518,390.78/3,921.13
  6. Step 6: Final answer
    x = 2,937.52

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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.