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Finding the Fourth Proportional to 779.41, 1,163.41 and 687.15

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Solution

The fourth proportional to 779.41, 1,163.41 and 687.15 is: 1,025.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.41 : 1,163.41 = 687.15 : x
  2. Step 2: Convert to fraction form
    779.41/1,163.41 = 687.15/x
  3. Step 3: Cross multiply
    779.41x = 1,163.41 × 687.15
  4. Step 4: Simplify right side
    779.41x = 799,438.90
  5. Step 5: Solve for x
    x = 799,438.90/779.41
  6. Step 6: Final answer
    x = 1,025.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.