Home / 21,815.07-30,103.97-13,331.38

Finding the Fourth Proportional to 21,815.07, 30,103.97 and 13,331.38

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Solution

The fourth proportional to 21,815.07, 30,103.97 and 13,331.38 is: 18,396.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,815.07 : 30,103.97 = 13,331.38 : x
  2. Step 2: Convert to fraction form
    21,815.07/30,103.97 = 13,331.38/x
  3. Step 3: Cross multiply
    21,815.07x = 30,103.97 × 13,331.38
  4. Step 4: Simplify right side
    21,815.07x = 401,327,421.65
  5. Step 5: Solve for x
    x = 401,327,421.65/21,815.07
  6. Step 6: Final answer
    x = 18,396.80

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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.