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Finding the Fourth Proportional to 629.50, 868.74 and 393.59

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Solution

The fourth proportional to 629.50, 868.74 and 393.59 is: 543.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.50 : 868.74 = 393.59 : x
  2. Step 2: Convert to fraction form
    629.50/868.74 = 393.59/x
  3. Step 3: Cross multiply
    629.50x = 868.74 × 393.59
  4. Step 4: Simplify right side
    629.50x = 341,927.38
  5. Step 5: Solve for x
    x = 341,927.38/629.50
  6. Step 6: Final answer
    x = 543.18

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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.