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Finding the Fourth Proportional to 8,715.44, 12,991.06 and 8,015.60

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Solution

The fourth proportional to 8,715.44, 12,991.06 and 8,015.60 is: 11,947.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,715.44 : 12,991.06 = 8,015.60 : x
  2. Step 2: Convert to fraction form
    8,715.44/12,991.06 = 8,015.60/x
  3. Step 3: Cross multiply
    8,715.44x = 12,991.06 × 8,015.60
  4. Step 4: Simplify right side
    8,715.44x = 104,131,140.54
  5. Step 5: Solve for x
    x = 104,131,140.54/8,715.44
  6. Step 6: Final answer
    x = 11,947.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.