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Finding the Fourth Proportional to 18,991.56, 28,493.10 and 13,455.63

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Solution

The fourth proportional to 18,991.56, 28,493.10 and 13,455.63 is: 20,187.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.56 : 28,493.10 = 13,455.63 : x
  2. Step 2: Convert to fraction form
    18,991.56/28,493.10 = 13,455.63/x
  3. Step 3: Cross multiply
    18,991.56x = 28,493.10 × 13,455.63
  4. Step 4: Simplify right side
    18,991.56x = 383,392,611.15
  5. Step 5: Solve for x
    x = 383,392,611.15/18,991.56
  6. Step 6: Final answer
    x = 20,187.53

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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.