Home / 3,897.09-5,377.96-2,128.70

Finding the Fourth Proportional to 3,897.09, 5,377.96 and 2,128.70

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Solution

The fourth proportional to 3,897.09, 5,377.96 and 2,128.70 is: 2,937.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,897.09 : 5,377.96 = 2,128.70 : x
  2. Step 2: Convert to fraction form
    3,897.09/5,377.96 = 2,128.70/x
  3. Step 3: Cross multiply
    3,897.09x = 5,377.96 × 2,128.70
  4. Step 4: Simplify right side
    3,897.09x = 11,448,025.92
  5. Step 5: Solve for x
    x = 11,448,025.92/3,897.09
  6. Step 6: Final answer
    x = 2,937.58

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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.