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Finding the Fourth Proportional to 326.96, 490.14 and 172.88

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Solution

The fourth proportional to 326.96, 490.14 and 172.88 is: 259.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.96 : 490.14 = 172.88 : x
  2. Step 2: Convert to fraction form
    326.96/490.14 = 172.88/x
  3. Step 3: Cross multiply
    326.96x = 490.14 × 172.88
  4. Step 4: Simplify right side
    326.96x = 84,735.40
  5. Step 5: Solve for x
    x = 84,735.40/326.96
  6. Step 6: Final answer
    x = 259.16

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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.