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Finding the Fourth Proportional to 608.40, 911.76 and 415.44

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Solution

The fourth proportional to 608.40, 911.76 and 415.44 is: 622.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.40 : 911.76 = 415.44 : x
  2. Step 2: Convert to fraction form
    608.40/911.76 = 415.44/x
  3. Step 3: Cross multiply
    608.40x = 911.76 × 415.44
  4. Step 4: Simplify right side
    608.40x = 378,781.57
  5. Step 5: Solve for x
    x = 378,781.57/608.40
  6. Step 6: Final answer
    x = 622.59

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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.