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Finding the Fourth Proportional to 7,999.56, 11,989.32 and 5,078.70

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Solution

The fourth proportional to 7,999.56, 11,989.32 and 5,078.70 is: 7,611.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,999.56 : 11,989.32 = 5,078.70 : x
  2. Step 2: Convert to fraction form
    7,999.56/11,989.32 = 5,078.70/x
  3. Step 3: Cross multiply
    7,999.56x = 11,989.32 × 5,078.70
  4. Step 4: Simplify right side
    7,999.56x = 60,890,159.48
  5. Step 5: Solve for x
    x = 60,890,159.48/7,999.56
  6. Step 6: Final answer
    x = 7,611.69

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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.