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Finding the Fourth Proportional to 394.32, 590.36 and 208.80

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Solution

The fourth proportional to 394.32, 590.36 and 208.80 is: 312.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.32 : 590.36 = 208.80 : x
  2. Step 2: Convert to fraction form
    394.32/590.36 = 208.80/x
  3. Step 3: Cross multiply
    394.32x = 590.36 × 208.80
  4. Step 4: Simplify right side
    394.32x = 123,265.17
  5. Step 5: Solve for x
    x = 123,265.17/394.32
  6. Step 6: Final answer
    x = 312.61

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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.