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Finding the Fourth Proportional to 19,705.56, 27,201.78 and 15,919.56

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Solution

The fourth proportional to 19,705.56, 27,201.78 and 15,919.56 is: 21,975.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,705.56 : 27,201.78 = 15,919.56 : x
  2. Step 2: Convert to fraction form
    19,705.56/27,201.78 = 15,919.56/x
  3. Step 3: Cross multiply
    19,705.56x = 27,201.78 × 15,919.56
  4. Step 4: Simplify right side
    19,705.56x = 433,040,368.82
  5. Step 5: Solve for x
    x = 433,040,368.82/19,705.56
  6. Step 6: Final answer
    x = 21,975.54

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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.