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Finding the Fourth Proportional to 381.33, 525.94 and 288.09

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Solution

The fourth proportional to 381.33, 525.94 and 288.09 is: 397.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.33 : 525.94 = 288.09 : x
  2. Step 2: Convert to fraction form
    381.33/525.94 = 288.09/x
  3. Step 3: Cross multiply
    381.33x = 525.94 × 288.09
  4. Step 4: Simplify right side
    381.33x = 151,518.05
  5. Step 5: Solve for x
    x = 151,518.05/381.33
  6. Step 6: Final answer
    x = 397.34

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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.