Home / 3,897.38-5,378.28-2,128.98

Finding the Fourth Proportional to 3,897.38, 5,378.28 and 2,128.98

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Solution

The fourth proportional to 3,897.38, 5,378.28 and 2,128.98 is: 2,937.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,897.38 : 5,378.28 = 2,128.98 : x
  2. Step 2: Convert to fraction form
    3,897.38/5,378.28 = 2,128.98/x
  3. Step 3: Cross multiply
    3,897.38x = 5,378.28 × 2,128.98
  4. Step 4: Simplify right side
    3,897.38x = 11,450,250.55
  5. Step 5: Solve for x
    x = 11,450,250.55/3,897.38
  6. Step 6: Final answer
    x = 2,937.94

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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.