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Finding the Fourth Proportional to 1,203.73, 1,661.11 and 679.79

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Solution

The fourth proportional to 1,203.73, 1,661.11 and 679.79 is: 938.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,203.73 : 1,661.11 = 679.79 : x
  2. Step 2: Convert to fraction form
    1,203.73/1,661.11 = 679.79/x
  3. Step 3: Cross multiply
    1,203.73x = 1,661.11 × 679.79
  4. Step 4: Simplify right side
    1,203.73x = 1,129,208.42
  5. Step 5: Solve for x
    x = 1,129,208.42/1,203.73
  6. Step 6: Final answer
    x = 938.09

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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.