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Finding the Fourth Proportional to 686.63, 1,029.48 and 321.23

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Solution

The fourth proportional to 686.63, 1,029.48 and 321.23 is: 481.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.63 : 1,029.48 = 321.23 : x
  2. Step 2: Convert to fraction form
    686.63/1,029.48 = 321.23/x
  3. Step 3: Cross multiply
    686.63x = 1,029.48 × 321.23
  4. Step 4: Simplify right side
    686.63x = 330,694.71
  5. Step 5: Solve for x
    x = 330,694.71/686.63
  6. Step 6: Final answer
    x = 481.62

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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.