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Finding the Fourth Proportional to 383.28, 574.41 and 209.69

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Solution

The fourth proportional to 383.28, 574.41 and 209.69 is: 314.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.28 : 574.41 = 209.69 : x
  2. Step 2: Convert to fraction form
    383.28/574.41 = 209.69/x
  3. Step 3: Cross multiply
    383.28x = 574.41 × 209.69
  4. Step 4: Simplify right side
    383.28x = 120,444.37
  5. Step 5: Solve for x
    x = 120,444.37/383.28
  6. Step 6: Final answer
    x = 314.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.