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Finding the Fourth Proportional to 863.64, 1,189.02 and 687.96

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Solution

The fourth proportional to 863.64, 1,189.02 and 687.96 is: 947.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.64 : 1,189.02 = 687.96 : x
  2. Step 2: Convert to fraction form
    863.64/1,189.02 = 687.96/x
  3. Step 3: Cross multiply
    863.64x = 1,189.02 × 687.96
  4. Step 4: Simplify right side
    863.64x = 817,998.20
  5. Step 5: Solve for x
    x = 817,998.20/863.64
  6. Step 6: Final answer
    x = 947.15

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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.