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Finding the Fourth Proportional to 644.45, 966.31 and 278.94

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Solution

The fourth proportional to 644.45, 966.31 and 278.94 is: 418.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.45 : 966.31 = 278.94 : x
  2. Step 2: Convert to fraction form
    644.45/966.31 = 278.94/x
  3. Step 3: Cross multiply
    644.45x = 966.31 × 278.94
  4. Step 4: Simplify right side
    644.45x = 269,542.51
  5. Step 5: Solve for x
    x = 269,542.51/644.45
  6. Step 6: Final answer
    x = 418.25

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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.