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Finding the Fourth Proportional to 328.48, 493.14 and 220.75

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Solution

The fourth proportional to 328.48, 493.14 and 220.75 is: 331.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.48 : 493.14 = 220.75 : x
  2. Step 2: Convert to fraction form
    328.48/493.14 = 220.75/x
  3. Step 3: Cross multiply
    328.48x = 493.14 × 220.75
  4. Step 4: Simplify right side
    328.48x = 108,860.66
  5. Step 5: Solve for x
    x = 108,860.66/328.48
  6. Step 6: Final answer
    x = 331.41

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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.