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Finding the Fourth Proportional to 676.89, 1,012.91 and 665.96

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Solution

The fourth proportional to 676.89, 1,012.91 and 665.96 is: 996.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.89 : 1,012.91 = 665.96 : x
  2. Step 2: Convert to fraction form
    676.89/1,012.91 = 665.96/x
  3. Step 3: Cross multiply
    676.89x = 1,012.91 × 665.96
  4. Step 4: Simplify right side
    676.89x = 674,549.15
  5. Step 5: Solve for x
    x = 674,549.15/676.89
  6. Step 6: Final answer
    x = 996.54

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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.