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Finding the Fourth Proportional to 686.73, 1,028.72 and 412.67

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Solution

The fourth proportional to 686.73, 1,028.72 and 412.67 is: 618.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.73 : 1,028.72 = 412.67 : x
  2. Step 2: Convert to fraction form
    686.73/1,028.72 = 412.67/x
  3. Step 3: Cross multiply
    686.73x = 1,028.72 × 412.67
  4. Step 4: Simplify right side
    686.73x = 424,525.49
  5. Step 5: Solve for x
    x = 424,525.49/686.73
  6. Step 6: Final answer
    x = 618.18

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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.