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Finding the Fourth Proportional to 631.21, 944.38 and 424.80

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Solution

The fourth proportional to 631.21, 944.38 and 424.80 is: 635.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.21 : 944.38 = 424.80 : x
  2. Step 2: Convert to fraction form
    631.21/944.38 = 424.80/x
  3. Step 3: Cross multiply
    631.21x = 944.38 × 424.80
  4. Step 4: Simplify right side
    631.21x = 401,172.62
  5. Step 5: Solve for x
    x = 401,172.62/631.21
  6. Step 6: Final answer
    x = 635.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.