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Finding the Fourth Proportional to 8,679.60, 11,979.40 and 5,144.56

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Solution

The fourth proportional to 8,679.60, 11,979.40 and 5,144.56 is: 7,100.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,679.60 : 11,979.40 = 5,144.56 : x
  2. Step 2: Convert to fraction form
    8,679.60/11,979.40 = 5,144.56/x
  3. Step 3: Cross multiply
    8,679.60x = 11,979.40 × 5,144.56
  4. Step 4: Simplify right side
    8,679.60x = 61,628,742.06
  5. Step 5: Solve for x
    x = 61,628,742.06/8,679.60
  6. Step 6: Final answer
    x = 7,100.41

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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.