Home / 21,912.75-30,245.80-12,963.37

Finding the Fourth Proportional to 21,912.75, 30,245.80 and 12,963.37

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Solution

The fourth proportional to 21,912.75, 30,245.80 and 12,963.37 is: 17,893.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,912.75 : 30,245.80 = 12,963.37 : x
  2. Step 2: Convert to fraction form
    21,912.75/30,245.80 = 12,963.37/x
  3. Step 3: Cross multiply
    21,912.75x = 30,245.80 × 12,963.37
  4. Step 4: Simplify right side
    21,912.75x = 392,087,345.12
  5. Step 5: Solve for x
    x = 392,087,345.12/21,912.75
  6. Step 6: Final answer
    x = 17,893.11

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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.