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Finding the Fourth Proportional to 644.69, 967.38 and 279.45

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Solution

The fourth proportional to 644.69, 967.38 and 279.45 is: 419.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.69 : 967.38 = 279.45 : x
  2. Step 2: Convert to fraction form
    644.69/967.38 = 279.45/x
  3. Step 3: Cross multiply
    644.69x = 967.38 × 279.45
  4. Step 4: Simplify right side
    644.69x = 270,334.34
  5. Step 5: Solve for x
    x = 270,334.34/644.69
  6. Step 6: Final answer
    x = 419.32

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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.