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Finding the Fourth Proportional to 1,203.73, 1,660.65 and 871.42

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Solution

The fourth proportional to 1,203.73, 1,660.65 and 871.42 is: 1,202.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,203.73 : 1,660.65 = 871.42 : x
  2. Step 2: Convert to fraction form
    1,203.73/1,660.65 = 871.42/x
  3. Step 3: Cross multiply
    1,203.73x = 1,660.65 × 871.42
  4. Step 4: Simplify right side
    1,203.73x = 1,447,123.62
  5. Step 5: Solve for x
    x = 1,447,123.62/1,203.73
  6. Step 6: Final answer
    x = 1,202.20

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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.