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Finding the Fourth Proportional to 719.91, 1,079 and 329.79

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Solution

The fourth proportional to 719.91, 1,079 and 329.79 is: 494.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.91 : 1,079 = 329.79 : x
  2. Step 2: Convert to fraction form
    719.91/1,079 = 329.79/x
  3. Step 3: Cross multiply
    719.91x = 1,079 × 329.79
  4. Step 4: Simplify right side
    719.91x = 355,843.41
  5. Step 5: Solve for x
    x = 355,843.41/719.91
  6. Step 6: Final answer
    x = 494.29

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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.