Home / 3,969.78-5,478.37-2,177.22

Finding the Fourth Proportional to 3,969.78, 5,478.37 and 2,177.22

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Solution

The fourth proportional to 3,969.78, 5,478.37 and 2,177.22 is: 3,004.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,969.78 : 5,478.37 = 2,177.22 : x
  2. Step 2: Convert to fraction form
    3,969.78/5,478.37 = 2,177.22/x
  3. Step 3: Cross multiply
    3,969.78x = 5,478.37 × 2,177.22
  4. Step 4: Simplify right side
    3,969.78x = 11,927,616.73
  5. Step 5: Solve for x
    x = 11,927,616.73/3,969.78
  6. Step 6: Final answer
    x = 3,004.60

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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.