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Finding the Fourth Proportional to 2,219.78, 3,329.63 and 680.74

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Solution

The fourth proportional to 2,219.78, 3,329.63 and 680.74 is: 1,021.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,219.78 : 3,329.63 = 680.74 : x
  2. Step 2: Convert to fraction form
    2,219.78/3,329.63 = 680.74/x
  3. Step 3: Cross multiply
    2,219.78x = 3,329.63 × 680.74
  4. Step 4: Simplify right side
    2,219.78x = 2,266,612.33
  5. Step 5: Solve for x
    x = 2,266,612.33/2,219.78
  6. Step 6: Final answer
    x = 1,021.10

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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.