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Finding the Fourth Proportional to 8,659.51, 12,991.79 and 3,112.73

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Solution

The fourth proportional to 8,659.51, 12,991.79 and 3,112.73 is: 4,670.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,659.51 : 12,991.79 = 3,112.73 : x
  2. Step 2: Convert to fraction form
    8,659.51/12,991.79 = 3,112.73/x
  3. Step 3: Cross multiply
    8,659.51x = 12,991.79 × 3,112.73
  4. Step 4: Simplify right side
    8,659.51x = 40,439,926.03
  5. Step 5: Solve for x
    x = 40,439,926.03/8,659.51
  6. Step 6: Final answer
    x = 4,670.00

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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.