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Finding the Fourth Proportional to 1,221.48, 1,685.34 and 871.56

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Solution

The fourth proportional to 1,221.48, 1,685.34 and 871.56 is: 1,202.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.48 : 1,685.34 = 871.56 : x
  2. Step 2: Convert to fraction form
    1,221.48/1,685.34 = 871.56/x
  3. Step 3: Cross multiply
    1,221.48x = 1,685.34 × 871.56
  4. Step 4: Simplify right side
    1,221.48x = 1,468,874.93
  5. Step 5: Solve for x
    x = 1,468,874.93/1,221.48
  6. Step 6: Final answer
    x = 1,202.54

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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.