Home / 21,813.21-30,103.79-12,382.38

Finding the Fourth Proportional to 21,813.21, 30,103.79 and 12,382.38

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Solution

The fourth proportional to 21,813.21, 30,103.79 and 12,382.38 is: 17,088.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,813.21 : 30,103.79 = 12,382.38 : x
  2. Step 2: Convert to fraction form
    21,813.21/30,103.79 = 12,382.38/x
  3. Step 3: Cross multiply
    21,813.21x = 30,103.79 × 12,382.38
  4. Step 4: Simplify right side
    21,813.21x = 372,756,567.22
  5. Step 5: Solve for x
    x = 372,756,567.22/21,813.21
  6. Step 6: Final answer
    x = 17,088.57

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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.