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Finding the Fourth Proportional to 390.44, 539.06 and 243.29

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Solution

The fourth proportional to 390.44, 539.06 and 243.29 is: 335.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.44 : 539.06 = 243.29 : x
  2. Step 2: Convert to fraction form
    390.44/539.06 = 243.29/x
  3. Step 3: Cross multiply
    390.44x = 539.06 × 243.29
  4. Step 4: Simplify right side
    390.44x = 131,147.91
  5. Step 5: Solve for x
    x = 131,147.91/390.44
  6. Step 6: Final answer
    x = 335.90

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.