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Finding the Fourth Proportional to 19,993.80, 29,976.30 and 11,231.40

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Solution

The fourth proportional to 19,993.80, 29,976.30 and 11,231.40 is: 16,839.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,993.80 : 29,976.30 = 11,231.40 : x
  2. Step 2: Convert to fraction form
    19,993.80/29,976.30 = 11,231.40/x
  3. Step 3: Cross multiply
    19,993.80x = 29,976.30 × 11,231.40
  4. Step 4: Simplify right side
    19,993.80x = 336,675,815.82
  5. Step 5: Solve for x
    x = 336,675,815.82/19,993.80
  6. Step 6: Final answer
    x = 16,839.01

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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.