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Finding the Fourth Proportional to 636.78, 954.42 and 311.40

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Solution

The fourth proportional to 636.78, 954.42 and 311.40 is: 466.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.78 : 954.42 = 311.40 : x
  2. Step 2: Convert to fraction form
    636.78/954.42 = 311.40/x
  3. Step 3: Cross multiply
    636.78x = 954.42 × 311.40
  4. Step 4: Simplify right side
    636.78x = 297,206.39
  5. Step 5: Solve for x
    x = 297,206.39/636.78
  6. Step 6: Final answer
    x = 466.73

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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.