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Finding the Fourth Proportional to 8,919.92, 12,309.94 and 5,383.08

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Solution

The fourth proportional to 8,919.92, 12,309.94 and 5,383.08 is: 7,428.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,919.92 : 12,309.94 = 5,383.08 : x
  2. Step 2: Convert to fraction form
    8,919.92/12,309.94 = 5,383.08/x
  3. Step 3: Cross multiply
    8,919.92x = 12,309.94 × 5,383.08
  4. Step 4: Simplify right side
    8,919.92x = 66,265,391.82
  5. Step 5: Solve for x
    x = 66,265,391.82/8,919.92
  6. Step 6: Final answer
    x = 7,428.92

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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.