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Finding the Fourth Proportional to 719, 1,078.86 and 329

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Solution

The fourth proportional to 719, 1,078.86 and 329 is: 493.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    719 : 1,078.86 = 329 : x
  2. Step 2: Convert to fraction form
    719/1,078.86 = 329/x
  3. Step 3: Cross multiply
    719x = 1,078.86 × 329
  4. Step 4: Simplify right side
    719x = 354,944.94
  5. Step 5: Solve for x
    x = 354,944.94/719
  6. Step 6: Final answer
    x = 493.66

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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.