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Finding the Fourth Proportional to 719.75, 1,078.86 and 329.47

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Solution

The fourth proportional to 719.75, 1,078.86 and 329.47 is: 493.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.75 : 1,078.86 = 329.47 : x
  2. Step 2: Convert to fraction form
    719.75/1,078.86 = 329.47/x
  3. Step 3: Cross multiply
    719.75x = 1,078.86 × 329.47
  4. Step 4: Simplify right side
    719.75x = 355,452.00
  5. Step 5: Solve for x
    x = 355,452.00/719.75
  6. Step 6: Final answer
    x = 493.85

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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.