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Finding the Fourth Proportional to 629.09, 868.16 and 380.40

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Solution

The fourth proportional to 629.09, 868.16 and 380.40 is: 524.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.09 : 868.16 = 380.40 : x
  2. Step 2: Convert to fraction form
    629.09/868.16 = 380.40/x
  3. Step 3: Cross multiply
    629.09x = 868.16 × 380.40
  4. Step 4: Simplify right side
    629.09x = 330,248.06
  5. Step 5: Solve for x
    x = 330,248.06/629.09
  6. Step 6: Final answer
    x = 524.96

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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.