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Finding the Fourth Proportional to 233.31, 321.20 and 221.77

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Solution

The fourth proportional to 233.31, 321.20 and 221.77 is: 305.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    233.31 : 321.20 = 221.77 : x
  2. Step 2: Convert to fraction form
    233.31/321.20 = 221.77/x
  3. Step 3: Cross multiply
    233.31x = 321.20 × 221.77
  4. Step 4: Simplify right side
    233.31x = 71,230.92
  5. Step 5: Solve for x
    x = 71,230.92/233.31
  6. Step 6: Final answer
    x = 305.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.