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Finding the Fourth Proportional to 871.25, 1,202.38 and 644.34

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Solution

The fourth proportional to 871.25, 1,202.38 and 644.34 is: 889.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.25 : 1,202.38 = 644.34 : x
  2. Step 2: Convert to fraction form
    871.25/1,202.38 = 644.34/x
  3. Step 3: Cross multiply
    871.25x = 1,202.38 × 644.34
  4. Step 4: Simplify right side
    871.25x = 774,744.43
  5. Step 5: Solve for x
    x = 774,744.43/871.25
  6. Step 6: Final answer
    x = 889.24

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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.