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Finding the Fourth Proportional to 8,939.21, 12,336.23 and 5,213.21

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Solution

The fourth proportional to 8,939.21, 12,336.23 and 5,213.21 is: 7,194.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,939.21 : 12,336.23 = 5,213.21 : x
  2. Step 2: Convert to fraction form
    8,939.21/12,336.23 = 5,213.21/x
  3. Step 3: Cross multiply
    8,939.21x = 12,336.23 × 5,213.21
  4. Step 4: Simplify right side
    8,939.21x = 64,311,308.95
  5. Step 5: Solve for x
    x = 64,311,308.95/8,939.21
  6. Step 6: Final answer
    x = 7,194.30

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1.5x scale

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.