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Finding the Fourth Proportional to 415.55, 622.37 and 206.94

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Solution

The fourth proportional to 415.55, 622.37 and 206.94 is: 309.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.55 : 622.37 = 206.94 : x
  2. Step 2: Convert to fraction form
    415.55/622.37 = 206.94/x
  3. Step 3: Cross multiply
    415.55x = 622.37 × 206.94
  4. Step 4: Simplify right side
    415.55x = 128,791.43
  5. Step 5: Solve for x
    x = 128,791.43/415.55
  6. Step 6: Final answer
    x = 309.93

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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.