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Finding the Fourth Proportional to 415.29, 622.53 and 209.73

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Solution

The fourth proportional to 415.29, 622.53 and 209.73 is: 314.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.29 : 622.53 = 209.73 : x
  2. Step 2: Convert to fraction form
    415.29/622.53 = 209.73/x
  3. Step 3: Cross multiply
    415.29x = 622.53 × 209.73
  4. Step 4: Simplify right side
    415.29x = 130,563.22
  5. Step 5: Solve for x
    x = 130,563.22/415.29
  6. Step 6: Final answer
    x = 314.39

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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.