Home / 3,987.42-5,502.09-2,218.78

Finding the Fourth Proportional to 3,987.42, 5,502.09 and 2,218.78

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Solution

The fourth proportional to 3,987.42, 5,502.09 and 2,218.78 is: 3,061.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.42 : 5,502.09 = 2,218.78 : x
  2. Step 2: Convert to fraction form
    3,987.42/5,502.09 = 2,218.78/x
  3. Step 3: Cross multiply
    3,987.42x = 5,502.09 × 2,218.78
  4. Step 4: Simplify right side
    3,987.42x = 12,207,927.25
  5. Step 5: Solve for x
    x = 12,207,927.25/3,987.42
  6. Step 6: Final answer
    x = 3,061.61

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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.