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Finding the Fourth Proportional to 629.76, 943.64 and 423.54

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Solution

The fourth proportional to 629.76, 943.64 and 423.54 is: 634.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.76 : 943.64 = 423.54 : x
  2. Step 2: Convert to fraction form
    629.76/943.64 = 423.54/x
  3. Step 3: Cross multiply
    629.76x = 943.64 × 423.54
  4. Step 4: Simplify right side
    629.76x = 399,669.29
  5. Step 5: Solve for x
    x = 399,669.29/629.76
  6. Step 6: Final answer
    x = 634.64

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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.