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Finding the Fourth Proportional to 1,221.97, 1,686.30 and 662.44

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Solution

The fourth proportional to 1,221.97, 1,686.30 and 662.44 is: 914.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.97 : 1,686.30 = 662.44 : x
  2. Step 2: Convert to fraction form
    1,221.97/1,686.30 = 662.44/x
  3. Step 3: Cross multiply
    1,221.97x = 1,686.30 × 662.44
  4. Step 4: Simplify right side
    1,221.97x = 1,117,072.57
  5. Step 5: Solve for x
    x = 1,117,072.57/1,221.97
  6. Step 6: Final answer
    x = 914.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.