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Finding the Fourth Proportional to 644.63, 967.05 and 211.69

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Solution

The fourth proportional to 644.63, 967.05 and 211.69 is: 317.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.63 : 967.05 = 211.69 : x
  2. Step 2: Convert to fraction form
    644.63/967.05 = 211.69/x
  3. Step 3: Cross multiply
    644.63x = 967.05 × 211.69
  4. Step 4: Simplify right side
    644.63x = 204,712.40
  5. Step 5: Solve for x
    x = 204,712.40/644.63
  6. Step 6: Final answer
    x = 317.56

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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.