Home / 3,987.12-5,502.16-2,218.72

Finding the Fourth Proportional to 3,987.12, 5,502.16 and 2,218.72

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Solution

The fourth proportional to 3,987.12, 5,502.16 and 2,218.72 is: 3,061.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.12 : 5,502.16 = 2,218.72 : x
  2. Step 2: Convert to fraction form
    3,987.12/5,502.16 = 2,218.72/x
  3. Step 3: Cross multiply
    3,987.12x = 5,502.16 × 2,218.72
  4. Step 4: Simplify right side
    3,987.12x = 12,207,752.44
  5. Step 5: Solve for x
    x = 12,207,752.44/3,987.12
  6. Step 6: Final answer
    x = 3,061.80

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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.