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Finding the Fourth Proportional to 222.03, 330.43 and 215.55

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Solution

The fourth proportional to 222.03, 330.43 and 215.55 is: 320.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.03 : 330.43 = 215.55 : x
  2. Step 2: Convert to fraction form
    222.03/330.43 = 215.55/x
  3. Step 3: Cross multiply
    222.03x = 330.43 × 215.55
  4. Step 4: Simplify right side
    222.03x = 71,223.65
  5. Step 5: Solve for x
    x = 71,223.65/222.03
  6. Step 6: Final answer
    x = 320.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.