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Finding the Fourth Proportional to 415.02, 622.31 and 220.12

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Solution

The fourth proportional to 415.02, 622.31 and 220.12 is: 330.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.02 : 622.31 = 220.12 : x
  2. Step 2: Convert to fraction form
    415.02/622.31 = 220.12/x
  3. Step 3: Cross multiply
    415.02x = 622.31 × 220.12
  4. Step 4: Simplify right side
    415.02x = 136,981.78
  5. Step 5: Solve for x
    x = 136,981.78/415.02
  6. Step 6: Final answer
    x = 330.06

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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.