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Finding the Fourth Proportional to 328.39, 492.31 and 135.88

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Solution

The fourth proportional to 328.39, 492.31 and 135.88 is: 203.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.39 : 492.31 = 135.88 : x
  2. Step 2: Convert to fraction form
    328.39/492.31 = 135.88/x
  3. Step 3: Cross multiply
    328.39x = 492.31 × 135.88
  4. Step 4: Simplify right side
    328.39x = 66,895.08
  5. Step 5: Solve for x
    x = 66,895.08/328.39
  6. Step 6: Final answer
    x = 203.71

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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.