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Finding the Fourth Proportional to 611.72, 917.48 and 221.64

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Solution

The fourth proportional to 611.72, 917.48 and 221.64 is: 332.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.72 : 917.48 = 221.64 : x
  2. Step 2: Convert to fraction form
    611.72/917.48 = 221.64/x
  3. Step 3: Cross multiply
    611.72x = 917.48 × 221.64
  4. Step 4: Simplify right side
    611.72x = 203,349.16
  5. Step 5: Solve for x
    x = 203,349.16/611.72
  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.