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Finding the Fourth Proportional to 1,219.73, 1,828.78 and 672.17

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Solution

The fourth proportional to 1,219.73, 1,828.78 and 672.17 is: 1,007.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.73 : 1,828.78 = 672.17 : x
  2. Step 2: Convert to fraction form
    1,219.73/1,828.78 = 672.17/x
  3. Step 3: Cross multiply
    1,219.73x = 1,828.78 × 672.17
  4. Step 4: Simplify right side
    1,219.73x = 1,229,251.05
  5. Step 5: Solve for x
    x = 1,229,251.05/1,219.73
  6. Step 6: Final answer
    x = 1,007.81

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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.