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Finding the Fourth Proportional to 8,716.58, 12,029.10 and 5,131.72

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Solution

The fourth proportional to 8,716.58, 12,029.10 and 5,131.72 is: 7,081.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,716.58 : 12,029.10 = 5,131.72 : x
  2. Step 2: Convert to fraction form
    8,716.58/12,029.10 = 5,131.72/x
  3. Step 3: Cross multiply
    8,716.58x = 12,029.10 × 5,131.72
  4. Step 4: Simplify right side
    8,716.58x = 61,729,973.05
  5. Step 5: Solve for x
    x = 61,729,973.05/8,716.58
  6. Step 6: Final answer
    x = 7,081.90

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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.