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Finding the Fourth Proportional to 8,678.75, 12,999.15 and 5,336.82

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Solution

The fourth proportional to 8,678.75, 12,999.15 and 5,336.82 is: 7,993.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,678.75 : 12,999.15 = 5,336.82 : x
  2. Step 2: Convert to fraction form
    8,678.75/12,999.15 = 5,336.82/x
  3. Step 3: Cross multiply
    8,678.75x = 12,999.15 × 5,336.82
  4. Step 4: Simplify right side
    8,678.75x = 69,374,123.70
  5. Step 5: Solve for x
    x = 69,374,123.70/8,678.75
  6. Step 6: Final answer
    x = 7,993.57

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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.