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Finding the Fourth Proportional to 644.10, 966.15 and 211.30

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Solution

The fourth proportional to 644.10, 966.15 and 211.30 is: 316.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.10 : 966.15 = 211.30 : x
  2. Step 2: Convert to fraction form
    644.10/966.15 = 211.30/x
  3. Step 3: Cross multiply
    644.10x = 966.15 × 211.30
  4. Step 4: Simplify right side
    644.10x = 204,147.50
  5. Step 5: Solve for x
    x = 204,147.50/644.10
  6. Step 6: Final answer
    x = 316.95

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Double scale
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Similar ratio
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1.5x scale

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.