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Finding the Fourth Proportional to 54,258.96, 81,400.84 and 20,979.28

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Solution

The fourth proportional to 54,258.96, 81,400.84 and 20,979.28 is: 31,473.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,258.96 : 81,400.84 = 20,979.28 : x
  2. Step 2: Convert to fraction form
    54,258.96/81,400.84 = 20,979.28/x
  3. Step 3: Cross multiply
    54,258.96x = 81,400.84 × 20,979.28
  4. Step 4: Simplify right side
    54,258.96x = 1,707,731,014.60
  5. Step 5: Solve for x
    x = 1,707,731,014.60/54,258.96
  6. Step 6: Final answer
    x = 31,473.71

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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.