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Finding the Fourth Proportional to 323.80, 485.37 and 207.91

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Solution

The fourth proportional to 323.80, 485.37 and 207.91 is: 311.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.80 : 485.37 = 207.91 : x
  2. Step 2: Convert to fraction form
    323.80/485.37 = 207.91/x
  3. Step 3: Cross multiply
    323.80x = 485.37 × 207.91
  4. Step 4: Simplify right side
    323.80x = 100,913.28
  5. Step 5: Solve for x
    x = 100,913.28/323.80
  6. Step 6: Final answer
    x = 311.65

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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.