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Finding the Fourth Proportional to 328.29, 492.09 and 165.61

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Solution

The fourth proportional to 328.29, 492.09 and 165.61 is: 248.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.29 : 492.09 = 165.61 : x
  2. Step 2: Convert to fraction form
    328.29/492.09 = 165.61/x
  3. Step 3: Cross multiply
    328.29x = 492.09 × 165.61
  4. Step 4: Simplify right side
    328.29x = 81,495.02
  5. Step 5: Solve for x
    x = 81,495.02/328.29
  6. Step 6: Final answer
    x = 248.24

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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.