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Finding the Fourth Proportional to 19,993.80, 29,990.70 and 18,918.60

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Solution

The fourth proportional to 19,993.80, 29,990.70 and 18,918.60 is: 28,377.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,993.80 : 29,990.70 = 18,918.60 : x
  2. Step 2: Convert to fraction form
    19,993.80/29,990.70 = 18,918.60/x
  3. Step 3: Cross multiply
    19,993.80x = 29,990.70 × 18,918.60
  4. Step 4: Simplify right side
    19,993.80x = 567,382,057.02
  5. Step 5: Solve for x
    x = 567,382,057.02/19,993.80
  6. Step 6: Final answer
    x = 28,377.90

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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.