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Finding the Fourth Proportional to 328.15, 491.55 and 218.11

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Solution

The fourth proportional to 328.15, 491.55 and 218.11 is: 326.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.15 : 491.55 = 218.11 : x
  2. Step 2: Convert to fraction form
    328.15/491.55 = 218.11/x
  3. Step 3: Cross multiply
    328.15x = 491.55 × 218.11
  4. Step 4: Simplify right side
    328.15x = 107,211.97
  5. Step 5: Solve for x
    x = 107,211.97/328.15
  6. Step 6: Final answer
    x = 326.72

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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.