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Finding the Fourth Proportional to 328.09, 491.37 and 165.38

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Solution

The fourth proportional to 328.09, 491.37 and 165.38 is: 247.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.09 : 491.37 = 165.38 : x
  2. Step 2: Convert to fraction form
    328.09/491.37 = 165.38/x
  3. Step 3: Cross multiply
    328.09x = 491.37 × 165.38
  4. Step 4: Simplify right side
    328.09x = 81,259.49
  5. Step 5: Solve for x
    x = 81,259.49/328.09
  6. Step 6: Final answer
    x = 247.68

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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.