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Finding the Fourth Proportional to 785.26, 1,086.02 and 686.85

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Solution

The fourth proportional to 785.26, 1,086.02 and 686.85 is: 949.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.26 : 1,086.02 = 686.85 : x
  2. Step 2: Convert to fraction form
    785.26/1,086.02 = 686.85/x
  3. Step 3: Cross multiply
    785.26x = 1,086.02 × 686.85
  4. Step 4: Simplify right side
    785.26x = 745,932.84
  5. Step 5: Solve for x
    x = 745,932.84/785.26
  6. Step 6: Final answer
    x = 949.92

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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.