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Finding the Fourth Proportional to 399.46, 599.12 and 155.86

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Solution

The fourth proportional to 399.46, 599.12 and 155.86 is: 233.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.46 : 599.12 = 155.86 : x
  2. Step 2: Convert to fraction form
    399.46/599.12 = 155.86/x
  3. Step 3: Cross multiply
    399.46x = 599.12 × 155.86
  4. Step 4: Simplify right side
    399.46x = 93,375.07
  5. Step 5: Solve for x
    x = 93,375.07/399.46
  6. Step 6: Final answer
    x = 233.76

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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.