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Finding the Fourth Proportional to 328.68, 491.94 and 219.72

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Solution

The fourth proportional to 328.68, 491.94 and 219.72 is: 328.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.68 : 491.94 = 219.72 : x
  2. Step 2: Convert to fraction form
    328.68/491.94 = 219.72/x
  3. Step 3: Cross multiply
    328.68x = 491.94 × 219.72
  4. Step 4: Simplify right side
    328.68x = 108,089.06
  5. Step 5: Solve for x
    x = 108,089.06/328.68
  6. Step 6: Final answer
    x = 328.86

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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.