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Finding the Fourth Proportional to 7,894.70, 11,820.18 and 3,990.95

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Solution

The fourth proportional to 7,894.70, 11,820.18 and 3,990.95 is: 5,975.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,894.70 : 11,820.18 = 3,990.95 : x
  2. Step 2: Convert to fraction form
    7,894.70/11,820.18 = 3,990.95/x
  3. Step 3: Cross multiply
    7,894.70x = 11,820.18 × 3,990.95
  4. Step 4: Simplify right side
    7,894.70x = 47,173,747.37
  5. Step 5: Solve for x
    x = 47,173,747.37/7,894.70
  6. Step 6: Final answer
    x = 5,975.37

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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.