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Finding the Fourth Proportional to 772.75, 1,065.79 and 684.32

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Solution

The fourth proportional to 772.75, 1,065.79 and 684.32 is: 943.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.75 : 1,065.79 = 684.32 : x
  2. Step 2: Convert to fraction form
    772.75/1,065.79 = 684.32/x
  3. Step 3: Cross multiply
    772.75x = 1,065.79 × 684.32
  4. Step 4: Simplify right side
    772.75x = 729,344.93
  5. Step 5: Solve for x
    x = 729,344.93/772.75
  6. Step 6: Final answer
    x = 943.83

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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.