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Finding the Fourth Proportional to 789.59, 1,183.68 and 615.31

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Solution

The fourth proportional to 789.59, 1,183.68 and 615.31 is: 922.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.59 : 1,183.68 = 615.31 : x
  2. Step 2: Convert to fraction form
    789.59/1,183.68 = 615.31/x
  3. Step 3: Cross multiply
    789.59x = 1,183.68 × 615.31
  4. Step 4: Simplify right side
    789.59x = 728,327.18
  5. Step 5: Solve for x
    x = 728,327.18/789.59
  6. Step 6: Final answer
    x = 922.41

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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.