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Finding the Fourth Proportional to 636.81, 878.82 and 412.80

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Solution

The fourth proportional to 636.81, 878.82 and 412.80 is: 569.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.81 : 878.82 = 412.80 : x
  2. Step 2: Convert to fraction form
    636.81/878.82 = 412.80/x
  3. Step 3: Cross multiply
    636.81x = 878.82 × 412.80
  4. Step 4: Simplify right side
    636.81x = 362,775.54
  5. Step 5: Solve for x
    x = 362,775.54/636.81
  6. Step 6: Final answer
    x = 569.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.