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Finding the Fourth Proportional to 382.79, 528.33 and 243.09

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Solution

The fourth proportional to 382.79, 528.33 and 243.09 is: 335.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.79 : 528.33 = 243.09 : x
  2. Step 2: Convert to fraction form
    382.79/528.33 = 243.09/x
  3. Step 3: Cross multiply
    382.79x = 528.33 × 243.09
  4. Step 4: Simplify right side
    382.79x = 128,431.74
  5. Step 5: Solve for x
    x = 128,431.74/382.79
  6. Step 6: Final answer
    x = 335.52

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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.