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Finding the Fourth Proportional to 328.47, 492.90 and 136.09

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Solution

The fourth proportional to 328.47, 492.90 and 136.09 is: 204.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.47 : 492.90 = 136.09 : x
  2. Step 2: Convert to fraction form
    328.47/492.90 = 136.09/x
  3. Step 3: Cross multiply
    328.47x = 492.90 × 136.09
  4. Step 4: Simplify right side
    328.47x = 67,078.76
  5. Step 5: Solve for x
    x = 67,078.76/328.47
  6. Step 6: Final answer
    x = 204.22

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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.