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Finding the Fourth Proportional to 739.72, 1,108.92 and 306.60

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Solution

The fourth proportional to 739.72, 1,108.92 and 306.60 is: 459.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.72 : 1,108.92 = 306.60 : x
  2. Step 2: Convert to fraction form
    739.72/1,108.92 = 306.60/x
  3. Step 3: Cross multiply
    739.72x = 1,108.92 × 306.60
  4. Step 4: Simplify right side
    739.72x = 339,994.87
  5. Step 5: Solve for x
    x = 339,994.87/739.72
  6. Step 6: Final answer
    x = 459.63

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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.