Home / 3,987.13-5,502.12-2,218.72

Finding the Fourth Proportional to 3,987.13, 5,502.12 and 2,218.72

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Solution

The fourth proportional to 3,987.13, 5,502.12 and 2,218.72 is: 3,061.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.13 : 5,502.12 = 2,218.72 : x
  2. Step 2: Convert to fraction form
    3,987.13/5,502.12 = 2,218.72/x
  3. Step 3: Cross multiply
    3,987.13x = 5,502.12 × 2,218.72
  4. Step 4: Simplify right side
    3,987.13x = 12,207,663.69
  5. Step 5: Solve for x
    x = 12,207,663.69/3,987.13
  6. Step 6: Final answer
    x = 3,061.77

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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.