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Finding the Fourth Proportional to 381.63, 572.75 and 138.33

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Solution

The fourth proportional to 381.63, 572.75 and 138.33 is: 207.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.63 : 572.75 = 138.33 : x
  2. Step 2: Convert to fraction form
    381.63/572.75 = 138.33/x
  3. Step 3: Cross multiply
    381.63x = 572.75 × 138.33
  4. Step 4: Simplify right side
    381.63x = 79,228.51
  5. Step 5: Solve for x
    x = 79,228.51/381.63
  6. Step 6: Final answer
    x = 207.61

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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.