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Finding the Fourth Proportional to 629.60, 944.70 and 218.78

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Solution

The fourth proportional to 629.60, 944.70 and 218.78 is: 328.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.60 : 944.70 = 218.78 : x
  2. Step 2: Convert to fraction form
    629.60/944.70 = 218.78/x
  3. Step 3: Cross multiply
    629.60x = 944.70 × 218.78
  4. Step 4: Simplify right side
    629.60x = 206,681.47
  5. Step 5: Solve for x
    x = 206,681.47/629.60
  6. Step 6: Final answer
    x = 328.27

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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.