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Finding the Fourth Proportional to 739.89, 1,109.12 and 618.93

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Solution

The fourth proportional to 739.89, 1,109.12 and 618.93 is: 927.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.89 : 1,109.12 = 618.93 : x
  2. Step 2: Convert to fraction form
    739.89/1,109.12 = 618.93/x
  3. Step 3: Cross multiply
    739.89x = 1,109.12 × 618.93
  4. Step 4: Simplify right side
    739.89x = 686,464.55
  5. Step 5: Solve for x
    x = 686,464.55/739.89
  6. Step 6: Final answer
    x = 927.79

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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.