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Finding the Fourth Proportional to 394.43, 589.03 and 339.76

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Solution

The fourth proportional to 394.43, 589.03 and 339.76 is: 507.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.43 : 589.03 = 339.76 : x
  2. Step 2: Convert to fraction form
    394.43/589.03 = 339.76/x
  3. Step 3: Cross multiply
    394.43x = 589.03 × 339.76
  4. Step 4: Simplify right side
    394.43x = 200,128.83
  5. Step 5: Solve for x
    x = 200,128.83/394.43
  6. Step 6: Final answer
    x = 507.39

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.