Home / 3,897.40-5,378.20-2,218.60

Finding the Fourth Proportional to 3,897.40, 5,378.20 and 2,218.60

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Solution

The fourth proportional to 3,897.40, 5,378.20 and 2,218.60 is: 3,061.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,897.40 : 5,378.20 = 2,218.60 : x
  2. Step 2: Convert to fraction form
    3,897.40/5,378.20 = 2,218.60/x
  3. Step 3: Cross multiply
    3,897.40x = 5,378.20 × 2,218.60
  4. Step 4: Simplify right side
    3,897.40x = 11,932,074.52
  5. Step 5: Solve for x
    x = 11,932,074.52/3,897.40
  6. Step 6: Final answer
    x = 3,061.55

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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.