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Finding the Fourth Proportional to 611.87, 917.96 and 221.96

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Solution

The fourth proportional to 611.87, 917.96 and 221.96 is: 333.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.87 : 917.96 = 221.96 : x
  2. Step 2: Convert to fraction form
    611.87/917.96 = 221.96/x
  3. Step 3: Cross multiply
    611.87x = 917.96 × 221.96
  4. Step 4: Simplify right side
    611.87x = 203,751.59
  5. Step 5: Solve for x
    x = 203,751.59/611.87
  6. Step 6: Final answer
    x = 333.00

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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.