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Finding the Fourth Proportional to 428.75, 591.32 and 323.85

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Solution

The fourth proportional to 428.75, 591.32 and 323.85 is: 446.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.75 : 591.32 = 323.85 : x
  2. Step 2: Convert to fraction form
    428.75/591.32 = 323.85/x
  3. Step 3: Cross multiply
    428.75x = 591.32 × 323.85
  4. Step 4: Simplify right side
    428.75x = 191,497.36
  5. Step 5: Solve for x
    x = 191,497.36/428.75
  6. Step 6: Final answer
    x = 446.65

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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.