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Finding the Fourth Proportional to 644.64, 967.20 and 279.36

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Solution

The fourth proportional to 644.64, 967.20 and 279.36 is: 419.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.64 : 967.20 = 279.36 : x
  2. Step 2: Convert to fraction form
    644.64/967.20 = 279.36/x
  3. Step 3: Cross multiply
    644.64x = 967.20 × 279.36
  4. Step 4: Simplify right side
    644.64x = 270,196.99
  5. Step 5: Solve for x
    x = 270,196.99/644.64
  6. Step 6: Final answer
    x = 419.14

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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.