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Finding the Fourth Proportional to 611.63, 917.42 and 221.55

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Solution

The fourth proportional to 611.63, 917.42 and 221.55 is: 332.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.63 : 917.42 = 221.55 : x
  2. Step 2: Convert to fraction form
    611.63/917.42 = 221.55/x
  3. Step 3: Cross multiply
    611.63x = 917.42 × 221.55
  4. Step 4: Simplify right side
    611.63x = 203,253.29
  5. Step 5: Solve for x
    x = 203,253.29/611.63
  6. Step 6: Final answer
    x = 332.32

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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.