Home / 2,220.78-3,330.21-987.33

Finding the Fourth Proportional to 2,220.78, 3,330.21 and 987.33

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Solution

The fourth proportional to 2,220.78, 3,330.21 and 987.33 is: 1,480.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,220.78 : 3,330.21 = 987.33 : x
  2. Step 2: Convert to fraction form
    2,220.78/3,330.21 = 987.33/x
  3. Step 3: Cross multiply
    2,220.78x = 3,330.21 × 987.33
  4. Step 4: Simplify right side
    2,220.78x = 3,288,016.24
  5. Step 5: Solve for x
    x = 3,288,016.24/2,220.78
  6. Step 6: Final answer
    x = 1,480.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.