Home / 3,971.21-5,480.15-2,178.65

Finding the Fourth Proportional to 3,971.21, 5,480.15 and 2,178.65

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Solution

The fourth proportional to 3,971.21, 5,480.15 and 2,178.65 is: 3,006.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,971.21 : 5,480.15 = 2,178.65 : x
  2. Step 2: Convert to fraction form
    3,971.21/5,480.15 = 2,178.65/x
  3. Step 3: Cross multiply
    3,971.21x = 5,480.15 × 2,178.65
  4. Step 4: Simplify right side
    3,971.21x = 11,939,331.60
  5. Step 5: Solve for x
    x = 11,939,331.60/3,971.21
  6. Step 6: Final answer
    x = 3,006.48

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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.