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Finding the Fourth Proportional to 328.30, 492.42 and 84.81

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Solution

The fourth proportional to 328.30, 492.42 and 84.81 is: 127.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.30 : 492.42 = 84.81 : x
  2. Step 2: Convert to fraction form
    328.30/492.42 = 84.81/x
  3. Step 3: Cross multiply
    328.30x = 492.42 × 84.81
  4. Step 4: Simplify right side
    328.30x = 41,764.30
  5. Step 5: Solve for x
    x = 41,764.30/328.30
  6. Step 6: Final answer
    x = 127.21

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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.