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Finding the Fourth Proportional to 608.31, 911.79 and 261.43

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Solution

The fourth proportional to 608.31, 911.79 and 261.43 is: 391.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.31 : 911.79 = 261.43 : x
  2. Step 2: Convert to fraction form
    608.31/911.79 = 261.43/x
  3. Step 3: Cross multiply
    608.31x = 911.79 × 261.43
  4. Step 4: Simplify right side
    608.31x = 238,366.98
  5. Step 5: Solve for x
    x = 238,366.98/608.31
  6. Step 6: Final answer
    x = 391.85

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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.