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Finding the Fourth Proportional to 1,216.47, 1,821.26 and 945.73

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Solution

The fourth proportional to 1,216.47, 1,821.26 and 945.73 is: 1,415.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.47 : 1,821.26 = 945.73 : x
  2. Step 2: Convert to fraction form
    1,216.47/1,821.26 = 945.73/x
  3. Step 3: Cross multiply
    1,216.47x = 1,821.26 × 945.73
  4. Step 4: Simplify right side
    1,216.47x = 1,722,418.03
  5. Step 5: Solve for x
    x = 1,722,418.03/1,216.47
  6. Step 6: Final answer
    x = 1,415.91

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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.