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Finding the Fourth Proportional to 415.63, 622.10 and 220.35

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Solution

The fourth proportional to 415.63, 622.10 and 220.35 is: 329.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.63 : 622.10 = 220.35 : x
  2. Step 2: Convert to fraction form
    415.63/622.10 = 220.35/x
  3. Step 3: Cross multiply
    415.63x = 622.10 × 220.35
  4. Step 4: Simplify right side
    415.63x = 137,079.74
  5. Step 5: Solve for x
    x = 137,079.74/415.63
  6. Step 6: Final answer
    x = 329.81

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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.