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Finding the Fourth Proportional to 239.52, 357.09 and 221.46

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Solution

The fourth proportional to 239.52, 357.09 and 221.46 is: 330.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.52 : 357.09 = 221.46 : x
  2. Step 2: Convert to fraction form
    239.52/357.09 = 221.46/x
  3. Step 3: Cross multiply
    239.52x = 357.09 × 221.46
  4. Step 4: Simplify right side
    239.52x = 79,081.15
  5. Step 5: Solve for x
    x = 79,081.15/239.52
  6. Step 6: Final answer
    x = 330.17

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.