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Finding the Fourth Proportional to 218.84, 328.20 and 81.94

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Solution

The fourth proportional to 218.84, 328.20 and 81.94 is: 122.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.84 : 328.20 = 81.94 : x
  2. Step 2: Convert to fraction form
    218.84/328.20 = 81.94/x
  3. Step 3: Cross multiply
    218.84x = 328.20 × 81.94
  4. Step 4: Simplify right side
    218.84x = 26,892.71
  5. Step 5: Solve for x
    x = 26,892.71/218.84
  6. Step 6: Final answer
    x = 122.89

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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.