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Finding the Fourth Proportional to 611.33, 916.92 and 221.31

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Solution

The fourth proportional to 611.33, 916.92 and 221.31 is: 331.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.33 : 916.92 = 221.31 : x
  2. Step 2: Convert to fraction form
    611.33/916.92 = 221.31/x
  3. Step 3: Cross multiply
    611.33x = 916.92 × 221.31
  4. Step 4: Simplify right side
    611.33x = 202,923.57
  5. Step 5: Solve for x
    x = 202,923.57/611.33
  6. Step 6: Final answer
    x = 331.94

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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.