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Finding the Fourth Proportional to 629.88, 869.20 and 381.54

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Solution

The fourth proportional to 629.88, 869.20 and 381.54 is: 526.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.88 : 869.20 = 381.54 : x
  2. Step 2: Convert to fraction form
    629.88/869.20 = 381.54/x
  3. Step 3: Cross multiply
    629.88x = 869.20 × 381.54
  4. Step 4: Simplify right side
    629.88x = 331,636.87
  5. Step 5: Solve for x
    x = 331,636.87/629.88
  6. Step 6: Final answer
    x = 526.51

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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.