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Finding the Fourth Proportional to 399.60, 598.59 and 255.42

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Solution

The fourth proportional to 399.60, 598.59 and 255.42 is: 382.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.60 : 598.59 = 255.42 : x
  2. Step 2: Convert to fraction form
    399.60/598.59 = 255.42/x
  3. Step 3: Cross multiply
    399.60x = 598.59 × 255.42
  4. Step 4: Simplify right side
    399.60x = 152,891.86
  5. Step 5: Solve for x
    x = 152,891.86/399.60
  6. Step 6: Final answer
    x = 382.61

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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.