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Finding the Fourth Proportional to 380.33, 524.56 and 287.09

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Solution

The fourth proportional to 380.33, 524.56 and 287.09 is: 395.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.33 : 524.56 = 287.09 : x
  2. Step 2: Convert to fraction form
    380.33/524.56 = 287.09/x
  3. Step 3: Cross multiply
    380.33x = 524.56 × 287.09
  4. Step 4: Simplify right side
    380.33x = 150,595.93
  5. Step 5: Solve for x
    x = 150,595.93/380.33
  6. Step 6: Final answer
    x = 395.96

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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.