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Finding the Fourth Proportional to 218.98, 328.11 and 211.51

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Solution

The fourth proportional to 218.98, 328.11 and 211.51 is: 316.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.98 : 328.11 = 211.51 : x
  2. Step 2: Convert to fraction form
    218.98/328.11 = 211.51/x
  3. Step 3: Cross multiply
    218.98x = 328.11 × 211.51
  4. Step 4: Simplify right side
    218.98x = 69,398.55
  5. Step 5: Solve for x
    x = 69,398.55/218.98
  6. Step 6: Final answer
    x = 316.92

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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.