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Finding the Fourth Proportional to 739.11, 1,109.07 and 631.38

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Solution

The fourth proportional to 739.11, 1,109.07 and 631.38 is: 947.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.11 : 1,109.07 = 631.38 : x
  2. Step 2: Convert to fraction form
    739.11/1,109.07 = 631.38/x
  3. Step 3: Cross multiply
    739.11x = 1,109.07 × 631.38
  4. Step 4: Simplify right side
    739.11x = 700,244.62
  5. Step 5: Solve for x
    x = 700,244.62/739.11
  6. Step 6: Final answer
    x = 947.42

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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.