Home / 3,971.40-5,480.58-2,178.96

Finding the Fourth Proportional to 3,971.40, 5,480.58 and 2,178.96

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Solution

The fourth proportional to 3,971.40, 5,480.58 and 2,178.96 is: 3,006.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,971.40 : 5,480.58 = 2,178.96 : x
  2. Step 2: Convert to fraction form
    3,971.40/5,480.58 = 2,178.96/x
  3. Step 3: Cross multiply
    3,971.40x = 5,480.58 × 2,178.96
  4. Step 4: Simplify right side
    3,971.40x = 11,941,964.60
  5. Step 5: Solve for x
    x = 11,941,964.60/3,971.40
  6. Step 6: Final answer
    x = 3,006.99

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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.