Home / 54,139.97-81,178.78-20,855.70

Finding the Fourth Proportional to 54,139.97, 81,178.78 and 20,855.70

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Solution

The fourth proportional to 54,139.97, 81,178.78 and 20,855.70 is: 31,271.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,139.97 : 81,178.78 = 20,855.70 : x
  2. Step 2: Convert to fraction form
    54,139.97/81,178.78 = 20,855.70/x
  3. Step 3: Cross multiply
    54,139.97x = 81,178.78 × 20,855.70
  4. Step 4: Simplify right side
    54,139.97x = 1,693,040,555.98
  5. Step 5: Solve for x
    x = 1,693,040,555.98/54,139.97
  6. Step 6: Final answer
    x = 31,271.55

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1.5x scale

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.