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Finding the Fourth Proportional to 863.51, 1,187.05 and 743.43

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Solution

The fourth proportional to 863.51, 1,187.05 and 743.43 is: 1,021.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.51 : 1,187.05 = 743.43 : x
  2. Step 2: Convert to fraction form
    863.51/1,187.05 = 743.43/x
  3. Step 3: Cross multiply
    863.51x = 1,187.05 × 743.43
  4. Step 4: Simplify right side
    863.51x = 882,483.80
  5. Step 5: Solve for x
    x = 882,483.80/863.51
  6. Step 6: Final answer
    x = 1,021.97

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.