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Finding the Fourth Proportional to 776.12, 1,163.94 and 725

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Solution

The fourth proportional to 776.12, 1,163.94 and 725 is: 1,087.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.12 : 1,163.94 = 725 : x
  2. Step 2: Convert to fraction form
    776.12/1,163.94 = 725/x
  3. Step 3: Cross multiply
    776.12x = 1,163.94 × 725
  4. Step 4: Simplify right side
    776.12x = 843,856.50
  5. Step 5: Solve for x
    x = 843,856.50/776.12
  6. Step 6: Final answer
    x = 1,087.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.