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Finding the Fourth Proportional to 680.80, 1,019.57 and 371.89

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Solution

The fourth proportional to 680.80, 1,019.57 and 371.89 is: 556.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.80 : 1,019.57 = 371.89 : x
  2. Step 2: Convert to fraction form
    680.80/1,019.57 = 371.89/x
  3. Step 3: Cross multiply
    680.80x = 1,019.57 × 371.89
  4. Step 4: Simplify right side
    680.80x = 379,167.89
  5. Step 5: Solve for x
    x = 379,167.89/680.80
  6. Step 6: Final answer
    x = 556.94

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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.