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Finding the Fourth Proportional to 645.15, 967.22 and 320.75

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Solution

The fourth proportional to 645.15, 967.22 and 320.75 is: 480.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.15 : 967.22 = 320.75 : x
  2. Step 2: Convert to fraction form
    645.15/967.22 = 320.75/x
  3. Step 3: Cross multiply
    645.15x = 967.22 × 320.75
  4. Step 4: Simplify right side
    645.15x = 310,230.98
  5. Step 5: Solve for x
    x = 310,230.98/645.15
  6. Step 6: Final answer
    x = 480.87

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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.