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Finding the Fourth Proportional to 323.80, 485.60 and 285.32

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Solution

The fourth proportional to 323.80, 485.60 and 285.32 is: 427.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.80 : 485.60 = 285.32 : x
  2. Step 2: Convert to fraction form
    323.80/485.60 = 285.32/x
  3. Step 3: Cross multiply
    323.80x = 485.60 × 285.32
  4. Step 4: Simplify right side
    323.80x = 138,551.18
  5. Step 5: Solve for x
    x = 138,551.18/323.80
  6. Step 6: Final answer
    x = 427.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.