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Finding the Fourth Proportional to 683.10, 1,029.78 and 636.12

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Solution

The fourth proportional to 683.10, 1,029.78 and 636.12 is: 958.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.10 : 1,029.78 = 636.12 : x
  2. Step 2: Convert to fraction form
    683.10/1,029.78 = 636.12/x
  3. Step 3: Cross multiply
    683.10x = 1,029.78 × 636.12
  4. Step 4: Simplify right side
    683.10x = 655,063.65
  5. Step 5: Solve for x
    x = 655,063.65/683.10
  6. Step 6: Final answer
    x = 958.96

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.