Home / 2,221.45-3,330.63-988.20

Finding the Fourth Proportional to 2,221.45, 3,330.63 and 988.20

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Solution

The fourth proportional to 2,221.45, 3,330.63 and 988.20 is: 1,481.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,221.45 : 3,330.63 = 988.20 : x
  2. Step 2: Convert to fraction form
    2,221.45/3,330.63 = 988.20/x
  3. Step 3: Cross multiply
    2,221.45x = 3,330.63 × 988.20
  4. Step 4: Simplify right side
    2,221.45x = 3,291,328.57
  5. Step 5: Solve for x
    x = 3,291,328.57/2,221.45
  6. Step 6: Final answer
    x = 1,481.61

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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.