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Finding the Fourth Proportional to 428.96, 591.95 and 239.90

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Solution

The fourth proportional to 428.96, 591.95 and 239.90 is: 331.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.96 : 591.95 = 239.90 : x
  2. Step 2: Convert to fraction form
    428.96/591.95 = 239.90/x
  3. Step 3: Cross multiply
    428.96x = 591.95 × 239.90
  4. Step 4: Simplify right side
    428.96x = 142,010.88
  5. Step 5: Solve for x
    x = 142,010.88/428.96
  6. Step 6: Final answer
    x = 331.06

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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.