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Finding the Fourth Proportional to 239.79, 359.07 and 219.75

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Solution

The fourth proportional to 239.79, 359.07 and 219.75 is: 329.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.79 : 359.07 = 219.75 : x
  2. Step 2: Convert to fraction form
    239.79/359.07 = 219.75/x
  3. Step 3: Cross multiply
    239.79x = 359.07 × 219.75
  4. Step 4: Simplify right side
    239.79x = 78,903.46
  5. Step 5: Solve for x
    x = 78,903.46/239.79
  6. Step 6: Final answer
    x = 329.05

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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.