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Finding the Fourth Proportional to 539.31, 744.12 and 389.82

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Solution

The fourth proportional to 539.31, 744.12 and 389.82 is: 537.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.31 : 744.12 = 389.82 : x
  2. Step 2: Convert to fraction form
    539.31/744.12 = 389.82/x
  3. Step 3: Cross multiply
    539.31x = 744.12 × 389.82
  4. Step 4: Simplify right side
    539.31x = 290,072.86
  5. Step 5: Solve for x
    x = 290,072.86/539.31
  6. Step 6: Final answer
    x = 537.86

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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.