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Finding the Fourth Proportional to 611.96, 917.38 and 221.79

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Solution

The fourth proportional to 611.96, 917.38 and 221.79 is: 332.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.96 : 917.38 = 221.79 : x
  2. Step 2: Convert to fraction form
    611.96/917.38 = 221.79/x
  3. Step 3: Cross multiply
    611.96x = 917.38 × 221.79
  4. Step 4: Simplify right side
    611.96x = 203,463.02
  5. Step 5: Solve for x
    x = 203,463.02/611.96
  6. Step 6: Final answer
    x = 332.48

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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.