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Finding the Fourth Proportional to 328.40, 492.81 and 136.02

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Solution

The fourth proportional to 328.40, 492.81 and 136.02 is: 204.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.40 : 492.81 = 136.02 : x
  2. Step 2: Convert to fraction form
    328.40/492.81 = 136.02/x
  3. Step 3: Cross multiply
    328.40x = 492.81 × 136.02
  4. Step 4: Simplify right side
    328.40x = 67,032.02
  5. Step 5: Solve for x
    x = 67,032.02/328.40
  6. Step 6: Final answer
    x = 204.12

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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.