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Finding the Fourth Proportional to 1,429.25, 2,143.87 and 698.73

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Solution

The fourth proportional to 1,429.25, 2,143.87 and 698.73 is: 1,048.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,429.25 : 2,143.87 = 698.73 : x
  2. Step 2: Convert to fraction form
    1,429.25/2,143.87 = 698.73/x
  3. Step 3: Cross multiply
    1,429.25x = 2,143.87 × 698.73
  4. Step 4: Simplify right side
    1,429.25x = 1,497,976.50
  5. Step 5: Solve for x
    x = 1,497,976.50/1,429.25
  6. Step 6: Final answer
    x = 1,048.09

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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.