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Finding the Fourth Proportional to 1,221.91, 1,686.22 and 662.37

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Solution

The fourth proportional to 1,221.91, 1,686.22 and 662.37 is: 914.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.91 : 1,686.22 = 662.37 : x
  2. Step 2: Convert to fraction form
    1,221.91/1,686.22 = 662.37/x
  3. Step 3: Cross multiply
    1,221.91x = 1,686.22 × 662.37
  4. Step 4: Simplify right side
    1,221.91x = 1,116,901.54
  5. Step 5: Solve for x
    x = 1,116,901.54/1,221.91
  6. Step 6: Final answer
    x = 914.06

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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.