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Finding the Fourth Proportional to 631.36, 940.64 and 628.80

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Solution

The fourth proportional to 631.36, 940.64 and 628.80 is: 936.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.36 : 940.64 = 628.80 : x
  2. Step 2: Convert to fraction form
    631.36/940.64 = 628.80/x
  3. Step 3: Cross multiply
    631.36x = 940.64 × 628.80
  4. Step 4: Simplify right side
    631.36x = 591,474.43
  5. Step 5: Solve for x
    x = 591,474.43/631.36
  6. Step 6: Final answer
    x = 936.83

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.