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Finding the Fourth Proportional to 644.24, 965.80 and 279.32

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Solution

The fourth proportional to 644.24, 965.80 and 279.32 is: 418.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.24 : 965.80 = 279.32 : x
  2. Step 2: Convert to fraction form
    644.24/965.80 = 279.32/x
  3. Step 3: Cross multiply
    644.24x = 965.80 × 279.32
  4. Step 4: Simplify right side
    644.24x = 269,767.26
  5. Step 5: Solve for x
    x = 269,767.26/644.24
  6. Step 6: Final answer
    x = 418.74

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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.