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Finding the Fourth Proportional to 20,469.92, 30,694.55 and 7,980.32

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Solution

The fourth proportional to 20,469.92, 30,694.55 and 7,980.32 is: 11,966.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,469.92 : 30,694.55 = 7,980.32 : x
  2. Step 2: Convert to fraction form
    20,469.92/30,694.55 = 7,980.32/x
  3. Step 3: Cross multiply
    20,469.92x = 30,694.55 × 7,980.32
  4. Step 4: Simplify right side
    20,469.92x = 244,952,368.09
  5. Step 5: Solve for x
    x = 244,952,368.09/20,469.92
  6. Step 6: Final answer
    x = 11,966.46

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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.