Home / 3,921.91-5,412.38-2,153.65

Finding the Fourth Proportional to 3,921.91, 5,412.38 and 2,153.65

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Solution

The fourth proportional to 3,921.91, 5,412.38 and 2,153.65 is: 2,972.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,921.91 : 5,412.38 = 2,153.65 : x
  2. Step 2: Convert to fraction form
    3,921.91/5,412.38 = 2,153.65/x
  3. Step 3: Cross multiply
    3,921.91x = 5,412.38 × 2,153.65
  4. Step 4: Simplify right side
    3,921.91x = 11,656,372.19
  5. Step 5: Solve for x
    x = 11,656,372.19/3,921.91
  6. Step 6: Final answer
    x = 2,972.12

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Double scale
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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.