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Finding the Fourth Proportional to 428.21, 590.94 and 239.18

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Solution

The fourth proportional to 428.21, 590.94 and 239.18 is: 330.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.21 : 590.94 = 239.18 : x
  2. Step 2: Convert to fraction form
    428.21/590.94 = 239.18/x
  3. Step 3: Cross multiply
    428.21x = 590.94 × 239.18
  4. Step 4: Simplify right side
    428.21x = 141,338.07
  5. Step 5: Solve for x
    x = 141,338.07/428.21
  6. Step 6: Final answer
    x = 330.07

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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.