Home / 3,897.47-5,378.51-2,129.20

Finding the Fourth Proportional to 3,897.47, 5,378.51 and 2,129.20

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Solution

The fourth proportional to 3,897.47, 5,378.51 and 2,129.20 is: 2,938.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,897.47 : 5,378.51 = 2,129.20 : x
  2. Step 2: Convert to fraction form
    3,897.47/5,378.51 = 2,129.20/x
  3. Step 3: Cross multiply
    3,897.47x = 5,378.51 × 2,129.20
  4. Step 4: Simplify right side
    3,897.47x = 11,451,915.37
  5. Step 5: Solve for x
    x = 11,451,915.37/3,897.47
  6. Step 6: Final answer
    x = 2,938.29

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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.