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Finding the Fourth Proportional to 7,911.28, 11,866.92 and 2,979.60

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Solution

The fourth proportional to 7,911.28, 11,866.92 and 2,979.60 is: 4,469.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,911.28 : 11,866.92 = 2,979.60 : x
  2. Step 2: Convert to fraction form
    7,911.28/11,866.92 = 2,979.60/x
  3. Step 3: Cross multiply
    7,911.28x = 11,866.92 × 2,979.60
  4. Step 4: Simplify right side
    7,911.28x = 35,358,674.83
  5. Step 5: Solve for x
    x = 35,358,674.83/7,911.28
  6. Step 6: Final answer
    x = 4,469.40

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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.