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Finding the Fourth Proportional to 629.69, 869.15 and 380.97

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Solution

The fourth proportional to 629.69, 869.15 and 380.97 is: 525.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.69 : 869.15 = 380.97 : x
  2. Step 2: Convert to fraction form
    629.69/869.15 = 380.97/x
  3. Step 3: Cross multiply
    629.69x = 869.15 × 380.97
  4. Step 4: Simplify right side
    629.69x = 331,118.17
  5. Step 5: Solve for x
    x = 331,118.17/629.69
  6. Step 6: Final answer
    x = 525.84

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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.