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Finding the Fourth Proportional to 1,305.15, 1,801.61 and 863.66

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Solution

The fourth proportional to 1,305.15, 1,801.61 and 863.66 is: 1,192.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.15 : 1,801.61 = 863.66 : x
  2. Step 2: Convert to fraction form
    1,305.15/1,801.61 = 863.66/x
  3. Step 3: Cross multiply
    1,305.15x = 1,801.61 × 863.66
  4. Step 4: Simplify right side
    1,305.15x = 1,555,981.92
  5. Step 5: Solve for x
    x = 1,555,981.92/1,305.15
  6. Step 6: Final answer
    x = 1,192.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.