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Finding the Fourth Proportional to 326.79, 490.21 and 172.53

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Solution

The fourth proportional to 326.79, 490.21 and 172.53 is: 258.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.79 : 490.21 = 172.53 : x
  2. Step 2: Convert to fraction form
    326.79/490.21 = 172.53/x
  3. Step 3: Cross multiply
    326.79x = 490.21 × 172.53
  4. Step 4: Simplify right side
    326.79x = 84,575.50
  5. Step 5: Solve for x
    x = 84,575.50/326.79
  6. Step 6: Final answer
    x = 258.81

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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.