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Finding the Fourth Proportional to 12,395.92, 17,105.52 and 7,919.68

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Solution

The fourth proportional to 12,395.92, 17,105.52 and 7,919.68 is: 10,928.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,395.92 : 17,105.52 = 7,919.68 : x
  2. Step 2: Convert to fraction form
    12,395.92/17,105.52 = 7,919.68/x
  3. Step 3: Cross multiply
    12,395.92x = 17,105.52 × 7,919.68
  4. Step 4: Simplify right side
    12,395.92x = 135,470,244.63
  5. Step 5: Solve for x
    x = 135,470,244.63/12,395.92
  6. Step 6: Final answer
    x = 10,928.62

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1.5x scale

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.