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Finding the Fourth Proportional to 328.40, 492.36 and 135.92

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Solution

The fourth proportional to 328.40, 492.36 and 135.92 is: 203.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.40 : 492.36 = 135.92 : x
  2. Step 2: Convert to fraction form
    328.40/492.36 = 135.92/x
  3. Step 3: Cross multiply
    328.40x = 492.36 × 135.92
  4. Step 4: Simplify right side
    328.40x = 66,921.57
  5. Step 5: Solve for x
    x = 66,921.57/328.40
  6. Step 6: Final answer
    x = 203.78

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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.