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Finding the Fourth Proportional to 631.21, 871.62 and 610.55

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Solution

The fourth proportional to 631.21, 871.62 and 610.55 is: 843.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.21 : 871.62 = 610.55 : x
  2. Step 2: Convert to fraction form
    631.21/871.62 = 610.55/x
  3. Step 3: Cross multiply
    631.21x = 871.62 × 610.55
  4. Step 4: Simplify right side
    631.21x = 532,164.54
  5. Step 5: Solve for x
    x = 532,164.54/631.21
  6. Step 6: Final answer
    x = 843.09

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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.