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Finding the Fourth Proportional to 789.64, 1,183.50 and 399.64

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Solution

The fourth proportional to 789.64, 1,183.50 and 399.64 is: 598.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.64 : 1,183.50 = 399.64 : x
  2. Step 2: Convert to fraction form
    789.64/1,183.50 = 399.64/x
  3. Step 3: Cross multiply
    789.64x = 1,183.50 × 399.64
  4. Step 4: Simplify right side
    789.64x = 472,973.94
  5. Step 5: Solve for x
    x = 472,973.94/789.64
  6. Step 6: Final answer
    x = 598.97

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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.