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Finding the Fourth Proportional to 13,953, 20,939.10 and 5,745

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Solution

The fourth proportional to 13,953, 20,939.10 and 5,745 is: 8,621.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,953 : 20,939.10 = 5,745 : x
  2. Step 2: Convert to fraction form
    13,953/20,939.10 = 5,745/x
  3. Step 3: Cross multiply
    13,953x = 20,939.10 × 5,745
  4. Step 4: Simplify right side
    13,953x = 120,295,129.50
  5. Step 5: Solve for x
    x = 120,295,129.50/13,953
  6. Step 6: Final answer
    x = 8,621.45

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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.