Home / 3,897.12-5,378.04-2,128.68

Finding the Fourth Proportional to 3,897.12, 5,378.04 and 2,128.68

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Solution

The fourth proportional to 3,897.12, 5,378.04 and 2,128.68 is: 2,937.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,897.12 : 5,378.04 = 2,128.68 : x
  2. Step 2: Convert to fraction form
    3,897.12/5,378.04 = 2,128.68/x
  3. Step 3: Cross multiply
    3,897.12x = 5,378.04 × 2,128.68
  4. Step 4: Simplify right side
    3,897.12x = 11,448,126.19
  5. Step 5: Solve for x
    x = 11,448,126.19/3,897.12
  6. Step 6: Final answer
    x = 2,937.59

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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.