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Finding the Fourth Proportional to 328.41, 492.81 and 133.49

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Solution

The fourth proportional to 328.41, 492.81 and 133.49 is: 200.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.41 : 492.81 = 133.49 : x
  2. Step 2: Convert to fraction form
    328.41/492.81 = 133.49/x
  3. Step 3: Cross multiply
    328.41x = 492.81 × 133.49
  4. Step 4: Simplify right side
    328.41x = 65,785.94
  5. Step 5: Solve for x
    x = 65,785.94/328.41
  6. Step 6: Final answer
    x = 200.32

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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.