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Finding the Fourth Proportional to 399.31, 550.98 and 231.19

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Solution

The fourth proportional to 399.31, 550.98 and 231.19 is: 319.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.31 : 550.98 = 231.19 : x
  2. Step 2: Convert to fraction form
    399.31/550.98 = 231.19/x
  3. Step 3: Cross multiply
    399.31x = 550.98 × 231.19
  4. Step 4: Simplify right side
    399.31x = 127,378.31
  5. Step 5: Solve for x
    x = 127,378.31/399.31
  6. Step 6: Final answer
    x = 319.00

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.