Home / 3,897.34-5,378.35-2,128.84

Finding the Fourth Proportional to 3,897.34, 5,378.35 and 2,128.84

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Solution

The fourth proportional to 3,897.34, 5,378.35 and 2,128.84 is: 2,937.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,897.34 : 5,378.35 = 2,128.84 : x
  2. Step 2: Convert to fraction form
    3,897.34/5,378.35 = 2,128.84/x
  3. Step 3: Cross multiply
    3,897.34x = 5,378.35 × 2,128.84
  4. Step 4: Simplify right side
    3,897.34x = 11,449,646.61
  5. Step 5: Solve for x
    x = 11,449,646.61/3,897.34
  6. Step 6: Final answer
    x = 2,937.81

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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.