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Finding the Fourth Proportional to 629.90, 868.69 and 454.94

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Solution

The fourth proportional to 629.90, 868.69 and 454.94 is: 627.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.90 : 868.69 = 454.94 : x
  2. Step 2: Convert to fraction form
    629.90/868.69 = 454.94/x
  3. Step 3: Cross multiply
    629.90x = 868.69 × 454.94
  4. Step 4: Simplify right side
    629.90x = 395,201.83
  5. Step 5: Solve for x
    x = 395,201.83/629.90
  6. Step 6: Final answer
    x = 627.40

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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.