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Finding the Fourth Proportional to 644.19, 966.45 and 278.89

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Solution

The fourth proportional to 644.19, 966.45 and 278.89 is: 418.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.19 : 966.45 = 278.89 : x
  2. Step 2: Convert to fraction form
    644.19/966.45 = 278.89/x
  3. Step 3: Cross multiply
    644.19x = 966.45 × 278.89
  4. Step 4: Simplify right side
    644.19x = 269,527.01
  5. Step 5: Solve for x
    x = 269,527.01/644.19
  6. Step 6: Final answer
    x = 418.40

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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.