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Finding the Fourth Proportional to 989.98, 1,367.21 and 676.69

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Solution

The fourth proportional to 989.98, 1,367.21 and 676.69 is: 934.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.98 : 1,367.21 = 676.69 : x
  2. Step 2: Convert to fraction form
    989.98/1,367.21 = 676.69/x
  3. Step 3: Cross multiply
    989.98x = 1,367.21 × 676.69
  4. Step 4: Simplify right side
    989.98x = 925,177.33
  5. Step 5: Solve for x
    x = 925,177.33/989.98
  6. Step 6: Final answer
    x = 934.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.