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Finding the Fourth Proportional to 629.99, 869.47 and 394.18

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Solution

The fourth proportional to 629.99, 869.47 and 394.18 is: 544.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.99 : 869.47 = 394.18 : x
  2. Step 2: Convert to fraction form
    629.99/869.47 = 394.18/x
  3. Step 3: Cross multiply
    629.99x = 869.47 × 394.18
  4. Step 4: Simplify right side
    629.99x = 342,727.68
  5. Step 5: Solve for x
    x = 342,727.68/629.99
  6. Step 6: Final answer
    x = 544.02

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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.