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Finding the Fourth Proportional to 680.84, 1,021.26 and 193.88

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Solution

The fourth proportional to 680.84, 1,021.26 and 193.88 is: 290.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.84 : 1,021.26 = 193.88 : x
  2. Step 2: Convert to fraction form
    680.84/1,021.26 = 193.88/x
  3. Step 3: Cross multiply
    680.84x = 1,021.26 × 193.88
  4. Step 4: Simplify right side
    680.84x = 198,006.72
  5. Step 5: Solve for x
    x = 198,006.72/680.84
  6. Step 6: Final answer
    x = 290.83

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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.