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Finding the Fourth Proportional to 28,185.39, 38,921.99 and 21,099.51

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Solution

The fourth proportional to 28,185.39, 38,921.99 and 21,099.51 is: 29,136.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,185.39 : 38,921.99 = 21,099.51 : x
  2. Step 2: Convert to fraction form
    28,185.39/38,921.99 = 21,099.51/x
  3. Step 3: Cross multiply
    28,185.39x = 38,921.99 × 21,099.51
  4. Step 4: Simplify right side
    28,185.39x = 821,234,811.73
  5. Step 5: Solve for x
    x = 821,234,811.73/28,185.39
  6. Step 6: Final answer
    x = 29,136.90

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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.