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Finding the Fourth Proportional to 415.39, 622.91 and 122.79

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Solution

The fourth proportional to 415.39, 622.91 and 122.79 is: 184.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.39 : 622.91 = 122.79 : x
  2. Step 2: Convert to fraction form
    415.39/622.91 = 122.79/x
  3. Step 3: Cross multiply
    415.39x = 622.91 × 122.79
  4. Step 4: Simplify right side
    415.39x = 76,487.12
  5. Step 5: Solve for x
    x = 76,487.12/415.39
  6. Step 6: Final answer
    x = 184.13

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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.