Home / 3,987.28-5,501.40-2,218.45

Finding the Fourth Proportional to 3,987.28, 5,501.40 and 2,218.45

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Solution

The fourth proportional to 3,987.28, 5,501.40 and 2,218.45 is: 3,060.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.28 : 5,501.40 = 2,218.45 : x
  2. Step 2: Convert to fraction form
    3,987.28/5,501.40 = 2,218.45/x
  3. Step 3: Cross multiply
    3,987.28x = 5,501.40 × 2,218.45
  4. Step 4: Simplify right side
    3,987.28x = 12,204,580.83
  5. Step 5: Solve for x
    x = 12,204,580.83/3,987.28
  6. Step 6: Final answer
    x = 3,060.88

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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.