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Finding the Fourth Proportional to 399.27, 598.98 and 125.31

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Solution

The fourth proportional to 399.27, 598.98 and 125.31 is: 187.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.27 : 598.98 = 125.31 : x
  2. Step 2: Convert to fraction form
    399.27/598.98 = 125.31/x
  3. Step 3: Cross multiply
    399.27x = 598.98 × 125.31
  4. Step 4: Simplify right side
    399.27x = 75,059.68
  5. Step 5: Solve for x
    x = 75,059.68/399.27
  6. Step 6: Final answer
    x = 187.99

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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.