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Finding the Fourth Proportional to 605.49, 908.31 and 215.42

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Solution

The fourth proportional to 605.49, 908.31 and 215.42 is: 323.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    605.49 : 908.31 = 215.42 : x
  2. Step 2: Convert to fraction form
    605.49/908.31 = 215.42/x
  3. Step 3: Cross multiply
    605.49x = 908.31 × 215.42
  4. Step 4: Simplify right side
    605.49x = 195,663.60
  5. Step 5: Solve for x
    x = 195,663.60/605.49
  6. Step 6: Final answer
    x = 323.15

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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.