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Finding the Fourth Proportional to 233.19, 321.72 and 221.64

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Solution

The fourth proportional to 233.19, 321.72 and 221.64 is: 305.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    233.19 : 321.72 = 221.64 : x
  2. Step 2: Convert to fraction form
    233.19/321.72 = 221.64/x
  3. Step 3: Cross multiply
    233.19x = 321.72 × 221.64
  4. Step 4: Simplify right side
    233.19x = 71,306.02
  5. Step 5: Solve for x
    x = 71,306.02/233.19
  6. Step 6: Final answer
    x = 305.79

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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.