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Finding the Fourth Proportional to 399.63, 599.49 and 125.76

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Solution

The fourth proportional to 399.63, 599.49 and 125.76 is: 188.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.63 : 599.49 = 125.76 : x
  2. Step 2: Convert to fraction form
    399.63/599.49 = 125.76/x
  3. Step 3: Cross multiply
    399.63x = 599.49 × 125.76
  4. Step 4: Simplify right side
    399.63x = 75,391.86
  5. Step 5: Solve for x
    x = 75,391.86/399.63
  6. Step 6: Final answer
    x = 188.65

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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.