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Finding the Fourth Proportional to 644.50, 966.75 and 636.40

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Solution

The fourth proportional to 644.50, 966.75 and 636.40 is: 954.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.50 : 966.75 = 636.40 : x
  2. Step 2: Convert to fraction form
    644.50/966.75 = 636.40/x
  3. Step 3: Cross multiply
    644.50x = 966.75 × 636.40
  4. Step 4: Simplify right side
    644.50x = 615,239.70
  5. Step 5: Solve for x
    x = 615,239.70/644.50
  6. Step 6: Final answer
    x = 954.60

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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.