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Finding the Fourth Proportional to 644.73, 966.12 and 427.53

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Solution

The fourth proportional to 644.73, 966.12 and 427.53 is: 640.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.73 : 966.12 = 427.53 : x
  2. Step 2: Convert to fraction form
    644.73/966.12 = 427.53/x
  3. Step 3: Cross multiply
    644.73x = 966.12 × 427.53
  4. Step 4: Simplify right side
    644.73x = 413,043.15
  5. Step 5: Solve for x
    x = 413,043.15/644.73
  6. Step 6: Final answer
    x = 640.65

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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.