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Finding the Fourth Proportional to 54,470.70, 81,718.20 and 21,187.80

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Solution

The fourth proportional to 54,470.70, 81,718.20 and 21,187.80 is: 31,786.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,470.70 : 81,718.20 = 21,187.80 : x
  2. Step 2: Convert to fraction form
    54,470.70/81,718.20 = 21,187.80/x
  3. Step 3: Cross multiply
    54,470.70x = 81,718.20 × 21,187.80
  4. Step 4: Simplify right side
    54,470.70x = 1,731,428,877.96
  5. Step 5: Solve for x
    x = 1,731,428,877.96/54,470.70
  6. Step 6: Final answer
    x = 31,786.43

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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.