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Finding the Fourth Proportional to 739.89, 1,109.21 and 328.80

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Solution

The fourth proportional to 739.89, 1,109.21 and 328.80 is: 492.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.89 : 1,109.21 = 328.80 : x
  2. Step 2: Convert to fraction form
    739.89/1,109.21 = 328.80/x
  3. Step 3: Cross multiply
    739.89x = 1,109.21 × 328.80
  4. Step 4: Simplify right side
    739.89x = 364,706.60
  5. Step 5: Solve for x
    x = 364,706.60/739.89
  6. Step 6: Final answer
    x = 492.92

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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.