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Finding the Fourth Proportional to 779.29, 1,163.23 and 687.02

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Solution

The fourth proportional to 779.29, 1,163.23 and 687.02 is: 1,025.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.29 : 1,163.23 = 687.02 : x
  2. Step 2: Convert to fraction form
    779.29/1,163.23 = 687.02/x
  3. Step 3: Cross multiply
    779.29x = 1,163.23 × 687.02
  4. Step 4: Simplify right side
    779.29x = 799,158.84
  5. Step 5: Solve for x
    x = 799,158.84/779.29
  6. Step 6: Final answer
    x = 1,025.50

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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.