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Finding the Fourth Proportional to 436.78, 655.08 and 220.42

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Solution

The fourth proportional to 436.78, 655.08 and 220.42 is: 330.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.78 : 655.08 = 220.42 : x
  2. Step 2: Convert to fraction form
    436.78/655.08 = 220.42/x
  3. Step 3: Cross multiply
    436.78x = 655.08 × 220.42
  4. Step 4: Simplify right side
    436.78x = 144,392.73
  5. Step 5: Solve for x
    x = 144,392.73/436.78
  6. Step 6: Final answer
    x = 330.58

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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.