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Finding the Fourth Proportional to 843.29, 1,264.92 and 218.58

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Solution

The fourth proportional to 843.29, 1,264.92 and 218.58 is: 327.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.29 : 1,264.92 = 218.58 : x
  2. Step 2: Convert to fraction form
    843.29/1,264.92 = 218.58/x
  3. Step 3: Cross multiply
    843.29x = 1,264.92 × 218.58
  4. Step 4: Simplify right side
    843.29x = 276,486.21
  5. Step 5: Solve for x
    x = 276,486.21/843.29
  6. Step 6: Final answer
    x = 327.87

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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.