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Finding the Fourth Proportional to 645.45, 967.81 and 279.94

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Solution

The fourth proportional to 645.45, 967.81 and 279.94 is: 419.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.45 : 967.81 = 279.94 : x
  2. Step 2: Convert to fraction form
    645.45/967.81 = 279.94/x
  3. Step 3: Cross multiply
    645.45x = 967.81 × 279.94
  4. Step 4: Simplify right side
    645.45x = 270,928.73
  5. Step 5: Solve for x
    x = 270,928.73/645.45
  6. Step 6: Final answer
    x = 419.75

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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.