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Finding the Fourth Proportional to 611.84, 917.20 and 221.75

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Solution

The fourth proportional to 611.84, 917.20 and 221.75 is: 332.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.84 : 917.20 = 221.75 : x
  2. Step 2: Convert to fraction form
    611.84/917.20 = 221.75/x
  3. Step 3: Cross multiply
    611.84x = 917.20 × 221.75
  4. Step 4: Simplify right side
    611.84x = 203,383.96
  5. Step 5: Solve for x
    x = 203,383.96/611.84
  6. Step 6: Final answer
    x = 332.42

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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.