Home / 3,897.46-5,378.64-2,129.14

Finding the Fourth Proportional to 3,897.46, 5,378.64 and 2,129.14

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Solution

The fourth proportional to 3,897.46, 5,378.64 and 2,129.14 is: 2,938.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,897.46 : 5,378.64 = 2,129.14 : x
  2. Step 2: Convert to fraction form
    3,897.46/5,378.64 = 2,129.14/x
  3. Step 3: Cross multiply
    3,897.46x = 5,378.64 × 2,129.14
  4. Step 4: Simplify right side
    3,897.46x = 11,451,877.57
  5. Step 5: Solve for x
    x = 11,451,877.57/3,897.46
  6. Step 6: Final answer
    x = 2,938.29

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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.