Home / 20,422.12-30,629.82-12,678.76

Finding the Fourth Proportional to 20,422.12, 30,629.82 and 12,678.76

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Solution

The fourth proportional to 20,422.12, 30,629.82 and 12,678.76 is: 19,016.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,422.12 : 30,629.82 = 12,678.76 : x
  2. Step 2: Convert to fraction form
    20,422.12/30,629.82 = 12,678.76/x
  3. Step 3: Cross multiply
    20,422.12x = 30,629.82 × 12,678.76
  4. Step 4: Simplify right side
    20,422.12x = 388,348,136.62
  5. Step 5: Solve for x
    x = 388,348,136.62/20,422.12
  6. Step 6: Final answer
    x = 19,016.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.