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Finding the Fourth Proportional to 326.64, 488.92 and 172.36

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Solution

The fourth proportional to 326.64, 488.92 and 172.36 is: 257.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.64 : 488.92 = 172.36 : x
  2. Step 2: Convert to fraction form
    326.64/488.92 = 172.36/x
  3. Step 3: Cross multiply
    326.64x = 488.92 × 172.36
  4. Step 4: Simplify right side
    326.64x = 84,270.25
  5. Step 5: Solve for x
    x = 84,270.25/326.64
  6. Step 6: Final answer
    x = 257.99

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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.