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Finding the Fourth Proportional to 611.67, 917.61 and 221.55

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Solution

The fourth proportional to 611.67, 917.61 and 221.55 is: 332.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.67 : 917.61 = 221.55 : x
  2. Step 2: Convert to fraction form
    611.67/917.61 = 221.55/x
  3. Step 3: Cross multiply
    611.67x = 917.61 × 221.55
  4. Step 4: Simplify right side
    611.67x = 203,296.50
  5. Step 5: Solve for x
    x = 203,296.50/611.67
  6. Step 6: Final answer
    x = 332.36

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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.