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Finding the Fourth Proportional to 394.65, 590.52 and 279.21

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Solution

The fourth proportional to 394.65, 590.52 and 279.21 is: 417.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.65 : 590.52 = 279.21 : x
  2. Step 2: Convert to fraction form
    394.65/590.52 = 279.21/x
  3. Step 3: Cross multiply
    394.65x = 590.52 × 279.21
  4. Step 4: Simplify right side
    394.65x = 164,879.09
  5. Step 5: Solve for x
    x = 164,879.09/394.65
  6. Step 6: Final answer
    x = 417.79

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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.