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Finding the Fourth Proportional to 629.55, 868.67 and 393.46

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Solution

The fourth proportional to 629.55, 868.67 and 393.46 is: 542.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.55 : 868.67 = 393.46 : x
  2. Step 2: Convert to fraction form
    629.55/868.67 = 393.46/x
  3. Step 3: Cross multiply
    629.55x = 868.67 × 393.46
  4. Step 4: Simplify right side
    629.55x = 341,782.55
  5. Step 5: Solve for x
    x = 341,782.55/629.55
  6. Step 6: Final answer
    x = 542.90

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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.