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Finding the Fourth Proportional to 739.96, 1,107.66 and 643.96

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Solution

The fourth proportional to 739.96, 1,107.66 and 643.96 is: 963.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.96 : 1,107.66 = 643.96 : x
  2. Step 2: Convert to fraction form
    739.96/1,107.66 = 643.96/x
  3. Step 3: Cross multiply
    739.96x = 1,107.66 × 643.96
  4. Step 4: Simplify right side
    739.96x = 713,288.73
  5. Step 5: Solve for x
    x = 713,288.73/739.96
  6. Step 6: Final answer
    x = 963.96

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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.