Home / 3,897.66-5,378.56-2,218.80

Finding the Fourth Proportional to 3,897.66, 5,378.56 and 2,218.80

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Solution

The fourth proportional to 3,897.66, 5,378.56 and 2,218.80 is: 3,061.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,897.66 : 5,378.56 = 2,218.80 : x
  2. Step 2: Convert to fraction form
    3,897.66/5,378.56 = 2,218.80/x
  3. Step 3: Cross multiply
    3,897.66x = 5,378.56 × 2,218.80
  4. Step 4: Simplify right side
    3,897.66x = 11,933,948.93
  5. Step 5: Solve for x
    x = 11,933,948.93/3,897.66
  6. Step 6: Final answer
    x = 3,061.82

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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.