Home / 21,515.81-29,679.83-19,993.58

Finding the Fourth Proportional to 21,515.81, 29,679.83 and 19,993.58

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Solution

The fourth proportional to 21,515.81, 29,679.83 and 19,993.58 is: 27,579.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,515.81 : 29,679.83 = 19,993.58 : x
  2. Step 2: Convert to fraction form
    21,515.81/29,679.83 = 19,993.58/x
  3. Step 3: Cross multiply
    21,515.81x = 29,679.83 × 19,993.58
  4. Step 4: Simplify right side
    21,515.81x = 593,405,907.09
  5. Step 5: Solve for x
    x = 593,405,907.09/21,515.81
  6. Step 6: Final answer
    x = 27,579.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.