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Finding the Fourth Proportional to 863.15, 1,291.97 and 618.48

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Solution

The fourth proportional to 863.15, 1,291.97 and 618.48 is: 925.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.15 : 1,291.97 = 618.48 : x
  2. Step 2: Convert to fraction form
    863.15/1,291.97 = 618.48/x
  3. Step 3: Cross multiply
    863.15x = 1,291.97 × 618.48
  4. Step 4: Simplify right side
    863.15x = 799,059.15
  5. Step 5: Solve for x
    x = 799,059.15/863.15
  6. Step 6: Final answer
    x = 925.75

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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.