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Finding the Fourth Proportional to 789.75, 1,086.21 and 691.34

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Solution

The fourth proportional to 789.75, 1,086.21 and 691.34 is: 950.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.75 : 1,086.21 = 691.34 : x
  2. Step 2: Convert to fraction form
    789.75/1,086.21 = 691.34/x
  3. Step 3: Cross multiply
    789.75x = 1,086.21 × 691.34
  4. Step 4: Simplify right side
    789.75x = 750,934.99
  5. Step 5: Solve for x
    x = 750,934.99/789.75
  6. Step 6: Final answer
    x = 950.85

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1.5x scale

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.