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Finding the Fourth Proportional to 2,220, 3,330.40 and 758.80

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Solution

The fourth proportional to 2,220, 3,330.40 and 758.80 is: 1,138.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,220 : 3,330.40 = 758.80 : x
  2. Step 2: Convert to fraction form
    2,220/3,330.40 = 758.80/x
  3. Step 3: Cross multiply
    2,220x = 3,330.40 × 758.80
  4. Step 4: Simplify right side
    2,220x = 2,527,107.52
  5. Step 5: Solve for x
    x = 2,527,107.52/2,220
  6. Step 6: Final answer
    x = 1,138.34

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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.