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Finding the Fourth Proportional to 423.78, 584.46 and 312.96

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Solution

The fourth proportional to 423.78, 584.46 and 312.96 is: 431.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.78 : 584.46 = 312.96 : x
  2. Step 2: Convert to fraction form
    423.78/584.46 = 312.96/x
  3. Step 3: Cross multiply
    423.78x = 584.46 × 312.96
  4. Step 4: Simplify right side
    423.78x = 182,912.60
  5. Step 5: Solve for x
    x = 182,912.60/423.78
  6. Step 6: Final answer
    x = 431.62

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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.