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Finding the Fourth Proportional to 54,479.39, 81,724.40 and 21,202.16

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Solution

The fourth proportional to 54,479.39, 81,724.40 and 21,202.16 is: 31,805.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,479.39 : 81,724.40 = 21,202.16 : x
  2. Step 2: Convert to fraction form
    54,479.39/81,724.40 = 21,202.16/x
  3. Step 3: Cross multiply
    54,479.39x = 81,724.40 × 21,202.16
  4. Step 4: Simplify right side
    54,479.39x = 1,732,733,698.69
  5. Step 5: Solve for x
    x = 1,732,733,698.69/54,479.39
  6. Step 6: Final answer
    x = 31,805.31

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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.