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Finding the Fourth Proportional to 394.70, 589.97 and 278.37

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Solution

The fourth proportional to 394.70, 589.97 and 278.37 is: 416.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.70 : 589.97 = 278.37 : x
  2. Step 2: Convert to fraction form
    394.70/589.97 = 278.37/x
  3. Step 3: Cross multiply
    394.70x = 589.97 × 278.37
  4. Step 4: Simplify right side
    394.70x = 164,230.64
  5. Step 5: Solve for x
    x = 164,230.64/394.70
  6. Step 6: Final answer
    x = 416.10

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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.