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Finding the Fourth Proportional to 8,383.95, 12,579.39 and 4,221.72

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Solution

The fourth proportional to 8,383.95, 12,579.39 and 4,221.72 is: 6,334.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,383.95 : 12,579.39 = 4,221.72 : x
  2. Step 2: Convert to fraction form
    8,383.95/12,579.39 = 4,221.72/x
  3. Step 3: Cross multiply
    8,383.95x = 12,579.39 × 4,221.72
  4. Step 4: Simplify right side
    8,383.95x = 53,106,662.35
  5. Step 5: Solve for x
    x = 53,106,662.35/8,383.95
  6. Step 6: Final answer
    x = 6,334.32

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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.