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Finding the Fourth Proportional to 739.21, 1,109.62 and 629.15

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Solution

The fourth proportional to 739.21, 1,109.62 and 629.15 is: 944.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.21 : 1,109.62 = 629.15 : x
  2. Step 2: Convert to fraction form
    739.21/1,109.62 = 629.15/x
  3. Step 3: Cross multiply
    739.21x = 1,109.62 × 629.15
  4. Step 4: Simplify right side
    739.21x = 698,114.65
  5. Step 5: Solve for x
    x = 698,114.65/739.21
  6. Step 6: Final answer
    x = 944.41

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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.