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Finding the Fourth Proportional to 683.30, 1,018.04 and 673.78

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Solution

The fourth proportional to 683.30, 1,018.04 and 673.78 is: 1,003.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.30 : 1,018.04 = 673.78 : x
  2. Step 2: Convert to fraction form
    683.30/1,018.04 = 673.78/x
  3. Step 3: Cross multiply
    683.30x = 1,018.04 × 673.78
  4. Step 4: Simplify right side
    683.30x = 685,934.99
  5. Step 5: Solve for x
    x = 685,934.99/683.30
  6. Step 6: Final answer
    x = 1,003.86

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.