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Finding the Fourth Proportional to 21,843.08, 30,143.38 and 11,907.08

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Solution

The fourth proportional to 21,843.08, 30,143.38 and 11,907.08 is: 16,431.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,843.08 : 30,143.38 = 11,907.08 : x
  2. Step 2: Convert to fraction form
    21,843.08/30,143.38 = 11,907.08/x
  3. Step 3: Cross multiply
    21,843.08x = 30,143.38 × 11,907.08
  4. Step 4: Simplify right side
    21,843.08x = 358,919,637.13
  5. Step 5: Solve for x
    x = 358,919,637.13/21,843.08
  6. Step 6: Final answer
    x = 16,431.73

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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.