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Finding the Fourth Proportional to 680.84, 1,021.20 and 218.49

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Solution

The fourth proportional to 680.84, 1,021.20 and 218.49 is: 327.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.84 : 1,021.20 = 218.49 : x
  2. Step 2: Convert to fraction form
    680.84/1,021.20 = 218.49/x
  3. Step 3: Cross multiply
    680.84x = 1,021.20 × 218.49
  4. Step 4: Simplify right side
    680.84x = 223,119.89
  5. Step 5: Solve for x
    x = 223,119.89/680.84
  6. Step 6: Final answer
    x = 327.71

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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.