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Finding the Fourth Proportional to 629.67, 869.26 and 393.74

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Solution

The fourth proportional to 629.67, 869.26 and 393.74 is: 543.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.67 : 869.26 = 393.74 : x
  2. Step 2: Convert to fraction form
    629.67/869.26 = 393.74/x
  3. Step 3: Cross multiply
    629.67x = 869.26 × 393.74
  4. Step 4: Simplify right side
    629.67x = 342,257.55
  5. Step 5: Solve for x
    x = 342,257.55/629.67
  6. Step 6: Final answer
    x = 543.55

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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.