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Finding the Fourth Proportional to 428.43, 591.23 and 231.94

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Solution

The fourth proportional to 428.43, 591.23 and 231.94 is: 320.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.43 : 591.23 = 231.94 : x
  2. Step 2: Convert to fraction form
    428.43/591.23 = 231.94/x
  3. Step 3: Cross multiply
    428.43x = 591.23 × 231.94
  4. Step 4: Simplify right side
    428.43x = 137,131.21
  5. Step 5: Solve for x
    x = 137,131.21/428.43
  6. Step 6: Final answer
    x = 320.08

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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.