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Finding the Fourth Proportional to 328.74, 493.02 and 220.56

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Solution

The fourth proportional to 328.74, 493.02 and 220.56 is: 330.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.74 : 493.02 = 220.56 : x
  2. Step 2: Convert to fraction form
    328.74/493.02 = 220.56/x
  3. Step 3: Cross multiply
    328.74x = 493.02 × 220.56
  4. Step 4: Simplify right side
    328.74x = 108,740.49
  5. Step 5: Solve for x
    x = 108,740.49/328.74
  6. Step 6: Final answer
    x = 330.78

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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.