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Finding the Fourth Proportional to 380.75, 525.43 and 206.09

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Solution

The fourth proportional to 380.75, 525.43 and 206.09 is: 284.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.75 : 525.43 = 206.09 : x
  2. Step 2: Convert to fraction form
    380.75/525.43 = 206.09/x
  3. Step 3: Cross multiply
    380.75x = 525.43 × 206.09
  4. Step 4: Simplify right side
    380.75x = 108,282.73
  5. Step 5: Solve for x
    x = 108,282.73/380.75
  6. Step 6: Final answer
    x = 284.40

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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.