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Finding the Fourth Proportional to 54,585.60, 81,921.60 and 21,321.60

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Solution

The fourth proportional to 54,585.60, 81,921.60 and 21,321.60 is: 31,999.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,585.60 : 81,921.60 = 21,321.60 : x
  2. Step 2: Convert to fraction form
    54,585.60/81,921.60 = 21,321.60/x
  3. Step 3: Cross multiply
    54,585.60x = 81,921.60 × 21,321.60
  4. Step 4: Simplify right side
    54,585.60x = 1,746,699,586.56
  5. Step 5: Solve for x
    x = 1,746,699,586.56/54,585.60
  6. Step 6: Final answer
    x = 31,999.27

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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.