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Finding the Fourth Proportional to 680.56, 1,020.84 and 193.60

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Solution

The fourth proportional to 680.56, 1,020.84 and 193.60 is: 290.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.56 : 1,020.84 = 193.60 : x
  2. Step 2: Convert to fraction form
    680.56/1,020.84 = 193.60/x
  3. Step 3: Cross multiply
    680.56x = 1,020.84 × 193.60
  4. Step 4: Simplify right side
    680.56x = 197,634.62
  5. Step 5: Solve for x
    x = 197,634.62/680.56
  6. Step 6: Final answer
    x = 290.40

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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.