Home / 3,897.62-5,378.71-2,129.23

Finding the Fourth Proportional to 3,897.62, 5,378.71 and 2,129.23

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Solution

The fourth proportional to 3,897.62, 5,378.71 and 2,129.23 is: 2,938.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,897.62 : 5,378.71 = 2,129.23 : x
  2. Step 2: Convert to fraction form
    3,897.62/5,378.71 = 2,129.23/x
  3. Step 3: Cross multiply
    3,897.62x = 5,378.71 × 2,129.23
  4. Step 4: Simplify right side
    3,897.62x = 11,452,483.80
  5. Step 5: Solve for x
    x = 11,452,483.80/3,897.62
  6. Step 6: Final answer
    x = 2,938.33

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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.