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Finding the Fourth Proportional to 644.32, 965.76 and 278.92

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Solution

The fourth proportional to 644.32, 965.76 and 278.92 is: 418.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.32 : 965.76 = 278.92 : x
  2. Step 2: Convert to fraction form
    644.32/965.76 = 278.92/x
  3. Step 3: Cross multiply
    644.32x = 965.76 × 278.92
  4. Step 4: Simplify right side
    644.32x = 269,369.78
  5. Step 5: Solve for x
    x = 269,369.78/644.32
  6. Step 6: Final answer
    x = 418.07

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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.