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Finding the Fourth Proportional to 611.53, 917.40 and 221.59

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Solution

The fourth proportional to 611.53, 917.40 and 221.59 is: 332.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.53 : 917.40 = 221.59 : x
  2. Step 2: Convert to fraction form
    611.53/917.40 = 221.59/x
  3. Step 3: Cross multiply
    611.53x = 917.40 × 221.59
  4. Step 4: Simplify right side
    611.53x = 203,286.67
  5. Step 5: Solve for x
    x = 203,286.67/611.53
  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.