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Finding the Fourth Proportional to 328.45, 492.18 and 220.05

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Solution

The fourth proportional to 328.45, 492.18 and 220.05 is: 329.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.45 : 492.18 = 220.05 : x
  2. Step 2: Convert to fraction form
    328.45/492.18 = 220.05/x
  3. Step 3: Cross multiply
    328.45x = 492.18 × 220.05
  4. Step 4: Simplify right side
    328.45x = 108,304.21
  5. Step 5: Solve for x
    x = 108,304.21/328.45
  6. Step 6: Final answer
    x = 329.74

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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.