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Finding the Fourth Proportional to 863.54, 1,289.96 and 776.73

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Solution

The fourth proportional to 863.54, 1,289.96 and 776.73 is: 1,160.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.54 : 1,289.96 = 776.73 : x
  2. Step 2: Convert to fraction form
    863.54/1,289.96 = 776.73/x
  3. Step 3: Cross multiply
    863.54x = 1,289.96 × 776.73
  4. Step 4: Simplify right side
    863.54x = 1,001,952.57
  5. Step 5: Solve for x
    x = 1,001,952.57/863.54
  6. Step 6: Final answer
    x = 1,160.29

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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.