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Finding the Fourth Proportional to 1,199.78, 1,799.87 and 680.79

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Solution

The fourth proportional to 1,199.78, 1,799.87 and 680.79 is: 1,021.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,199.78 : 1,799.87 = 680.79 : x
  2. Step 2: Convert to fraction form
    1,199.78/1,799.87 = 680.79/x
  3. Step 3: Cross multiply
    1,199.78x = 1,799.87 × 680.79
  4. Step 4: Simplify right side
    1,199.78x = 1,225,330.55
  5. Step 5: Solve for x
    x = 1,225,330.55/1,199.78
  6. Step 6: Final answer
    x = 1,021.30

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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.