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Finding the Fourth Proportional to 383.92, 529.79 and 209.25

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Solution

The fourth proportional to 383.92, 529.79 and 209.25 is: 288.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.92 : 529.79 = 209.25 : x
  2. Step 2: Convert to fraction form
    383.92/529.79 = 209.25/x
  3. Step 3: Cross multiply
    383.92x = 529.79 × 209.25
  4. Step 4: Simplify right side
    383.92x = 110,857.51
  5. Step 5: Solve for x
    x = 110,857.51/383.92
  6. Step 6: Final answer
    x = 288.75

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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.