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Finding the Fourth Proportional to 785.84, 1,183.10 and 680

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Solution

The fourth proportional to 785.84, 1,183.10 and 680 is: 1,023.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.84 : 1,183.10 = 680 : x
  2. Step 2: Convert to fraction form
    785.84/1,183.10 = 680/x
  3. Step 3: Cross multiply
    785.84x = 1,183.10 × 680
  4. Step 4: Simplify right side
    785.84x = 804,508.00
  5. Step 5: Solve for x
    x = 804,508.00/785.84
  6. Step 6: Final answer
    x = 1,023.76

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.