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Finding the Fourth Proportional to 324.38, 490.10 and 321.50

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Solution

The fourth proportional to 324.38, 490.10 and 321.50 is: 485.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.38 : 490.10 = 321.50 : x
  2. Step 2: Convert to fraction form
    324.38/490.10 = 321.50/x
  3. Step 3: Cross multiply
    324.38x = 490.10 × 321.50
  4. Step 4: Simplify right side
    324.38x = 157,567.15
  5. Step 5: Solve for x
    x = 157,567.15/324.38
  6. Step 6: Final answer
    x = 485.75

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.