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Finding the Fourth Proportional to 789.14, 1,085.30 and 690.73

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Solution

The fourth proportional to 789.14, 1,085.30 and 690.73 is: 949.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.14 : 1,085.30 = 690.73 : x
  2. Step 2: Convert to fraction form
    789.14/1,085.30 = 690.73/x
  3. Step 3: Cross multiply
    789.14x = 1,085.30 × 690.73
  4. Step 4: Simplify right side
    789.14x = 749,645.69
  5. Step 5: Solve for x
    x = 749,645.69/789.14
  6. Step 6: Final answer
    x = 949.95

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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.