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Finding the Fourth Proportional to 686.45, 1,028.81 and 295.99

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Solution

The fourth proportional to 686.45, 1,028.81 and 295.99 is: 443.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.45 : 1,028.81 = 295.99 : x
  2. Step 2: Convert to fraction form
    686.45/1,028.81 = 295.99/x
  3. Step 3: Cross multiply
    686.45x = 1,028.81 × 295.99
  4. Step 4: Simplify right side
    686.45x = 304,515.64
  5. Step 5: Solve for x
    x = 304,515.64/686.45
  6. Step 6: Final answer
    x = 443.61

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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.