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Finding the Fourth Proportional to 686.09, 1,028.90 and 223.77

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Solution

The fourth proportional to 686.09, 1,028.90 and 223.77 is: 335.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.09 : 1,028.90 = 223.77 : x
  2. Step 2: Convert to fraction form
    686.09/1,028.90 = 223.77/x
  3. Step 3: Cross multiply
    686.09x = 1,028.90 × 223.77
  4. Step 4: Simplify right side
    686.09x = 230,235.83
  5. Step 5: Solve for x
    x = 230,235.83/686.09
  6. Step 6: Final answer
    x = 335.58

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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.