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Finding the Fourth Proportional to 873.96, 1,309.86 and 776.22

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Solution

The fourth proportional to 873.96, 1,309.86 and 776.22 is: 1,163.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.96 : 1,309.86 = 776.22 : x
  2. Step 2: Convert to fraction form
    873.96/1,309.86 = 776.22/x
  3. Step 3: Cross multiply
    873.96x = 1,309.86 × 776.22
  4. Step 4: Simplify right side
    873.96x = 1,016,739.53
  5. Step 5: Solve for x
    x = 1,016,739.53/873.96
  6. Step 6: Final answer
    x = 1,163.37

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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.