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Finding the Fourth Proportional to 605.51, 908.31 and 215.72

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Solution

The fourth proportional to 605.51, 908.31 and 215.72 is: 323.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    605.51 : 908.31 = 215.72 : x
  2. Step 2: Convert to fraction form
    605.51/908.31 = 215.72/x
  3. Step 3: Cross multiply
    605.51x = 908.31 × 215.72
  4. Step 4: Simplify right side
    605.51x = 195,942.86
  5. Step 5: Solve for x
    x = 195,942.86/605.51
  6. Step 6: Final answer
    x = 323.60

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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.