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Finding the Fourth Proportional to 328.70, 493.22 and 213.11

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Solution

The fourth proportional to 328.70, 493.22 and 213.11 is: 319.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.70 : 493.22 = 213.11 : x
  2. Step 2: Convert to fraction form
    328.70/493.22 = 213.11/x
  3. Step 3: Cross multiply
    328.70x = 493.22 × 213.11
  4. Step 4: Simplify right side
    328.70x = 105,106.58
  5. Step 5: Solve for x
    x = 105,106.58/328.70
  6. Step 6: Final answer
    x = 319.77

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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.