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Finding the Fourth Proportional to 54,558.40, 81,722.40 and 45,342.40

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Solution

The fourth proportional to 54,558.40, 81,722.40 and 45,342.40 is: 67,917.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,558.40 : 81,722.40 = 45,342.40 : x
  2. Step 2: Convert to fraction form
    54,558.40/81,722.40 = 45,342.40/x
  3. Step 3: Cross multiply
    54,558.40x = 81,722.40 × 45,342.40
  4. Step 4: Simplify right side
    54,558.40x = 3,705,489,749.76
  5. Step 5: Solve for x
    x = 3,705,489,749.76/54,558.40
  6. Step 6: Final answer
    x = 67,917.86

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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.