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Finding the Fourth Proportional to 428.46, 591.28 and 231.98

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Solution

The fourth proportional to 428.46, 591.28 and 231.98 is: 320.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.46 : 591.28 = 231.98 : x
  2. Step 2: Convert to fraction form
    428.46/591.28 = 231.98/x
  3. Step 3: Cross multiply
    428.46x = 591.28 × 231.98
  4. Step 4: Simplify right side
    428.46x = 137,161.92
  5. Step 5: Solve for x
    x = 137,161.92/428.46
  6. Step 6: Final answer
    x = 320.13

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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.