Home / 21,375.12-29,496.80-12,422.56

Finding the Fourth Proportional to 21,375.12, 29,496.80 and 12,422.56

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Solution

The fourth proportional to 21,375.12, 29,496.80 and 12,422.56 is: 17,142.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,375.12 : 29,496.80 = 12,422.56 : x
  2. Step 2: Convert to fraction form
    21,375.12/29,496.80 = 12,422.56/x
  3. Step 3: Cross multiply
    21,375.12x = 29,496.80 × 12,422.56
  4. Step 4: Simplify right side
    21,375.12x = 366,425,767.81
  5. Step 5: Solve for x
    x = 366,425,767.81/21,375.12
  6. Step 6: Final answer
    x = 17,142.63

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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.