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Finding the Fourth Proportional to 739.50, 1,109.31 and 300.78

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Solution

The fourth proportional to 739.50, 1,109.31 and 300.78 is: 451.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.50 : 1,109.31 = 300.78 : x
  2. Step 2: Convert to fraction form
    739.50/1,109.31 = 300.78/x
  3. Step 3: Cross multiply
    739.50x = 1,109.31 × 300.78
  4. Step 4: Simplify right side
    739.50x = 333,658.26
  5. Step 5: Solve for x
    x = 333,658.26/739.50
  6. Step 6: Final answer
    x = 451.19

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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.