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Finding the Fourth Proportional to 629.54, 868.63 and 380.81

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Solution

The fourth proportional to 629.54, 868.63 and 380.81 is: 525.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.54 : 868.63 = 380.81 : x
  2. Step 2: Convert to fraction form
    629.54/868.63 = 380.81/x
  3. Step 3: Cross multiply
    629.54x = 868.63 × 380.81
  4. Step 4: Simplify right side
    629.54x = 330,779.87
  5. Step 5: Solve for x
    x = 330,779.87/629.54
  6. Step 6: Final answer
    x = 525.43

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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.