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Finding the Fourth Proportional to 629.90, 868.79 and 443.45

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Solution

The fourth proportional to 629.90, 868.79 and 443.45 is: 611.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.90 : 868.79 = 443.45 : x
  2. Step 2: Convert to fraction form
    629.90/868.79 = 443.45/x
  3. Step 3: Cross multiply
    629.90x = 868.79 × 443.45
  4. Step 4: Simplify right side
    629.90x = 385,261.69
  5. Step 5: Solve for x
    x = 385,261.69/629.90
  6. Step 6: Final answer
    x = 611.62

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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.