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Finding the Fourth Proportional to 3,979.78, 5,969.67 and 1,243.78

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Solution

The fourth proportional to 3,979.78, 5,969.67 and 1,243.78 is: 1,865.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,979.78 : 5,969.67 = 1,243.78 : x
  2. Step 2: Convert to fraction form
    3,979.78/5,969.67 = 1,243.78/x
  3. Step 3: Cross multiply
    3,979.78x = 5,969.67 × 1,243.78
  4. Step 4: Simplify right side
    3,979.78x = 7,424,966.72
  5. Step 5: Solve for x
    x = 7,424,966.72/3,979.78
  6. Step 6: Final answer
    x = 1,865.67

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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.