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Finding the Fourth Proportional to 54,428.51, 81,621.81 and 21,144.21

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Solution

The fourth proportional to 54,428.51, 81,621.81 and 21,144.21 is: 31,708.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,428.51 : 81,621.81 = 21,144.21 : x
  2. Step 2: Convert to fraction form
    54,428.51/81,621.81 = 21,144.21/x
  3. Step 3: Cross multiply
    54,428.51x = 81,621.81 × 21,144.21
  4. Step 4: Simplify right side
    54,428.51x = 1,725,828,691.22
  5. Step 5: Solve for x
    x = 1,725,828,691.22/54,428.51
  6. Step 6: Final answer
    x = 31,708.18

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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.