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Finding the Fourth Proportional to 221.55, 304.46 and 211.39

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Solution

The fourth proportional to 221.55, 304.46 and 211.39 is: 290.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.55 : 304.46 = 211.39 : x
  2. Step 2: Convert to fraction form
    221.55/304.46 = 211.39/x
  3. Step 3: Cross multiply
    221.55x = 304.46 × 211.39
  4. Step 4: Simplify right side
    221.55x = 64,360.31
  5. Step 5: Solve for x
    x = 64,360.31/221.55
  6. Step 6: Final answer
    x = 290.50

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.