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Finding the Fourth Proportional to 680.79, 1,020.77 and 372.21

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Solution

The fourth proportional to 680.79, 1,020.77 and 372.21 is: 558.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.79 : 1,020.77 = 372.21 : x
  2. Step 2: Convert to fraction form
    680.79/1,020.77 = 372.21/x
  3. Step 3: Cross multiply
    680.79x = 1,020.77 × 372.21
  4. Step 4: Simplify right side
    680.79x = 379,940.80
  5. Step 5: Solve for x
    x = 379,940.80/680.79
  6. Step 6: Final answer
    x = 558.09

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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.