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Finding the Fourth Proportional to 66,198.90, 99,288.09 and 18,816.20

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Solution

The fourth proportional to 66,198.90, 99,288.09 and 18,816.20 is: 28,221.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,198.90 : 99,288.09 = 18,816.20 : x
  2. Step 2: Convert to fraction form
    66,198.90/99,288.09 = 18,816.20/x
  3. Step 3: Cross multiply
    66,198.90x = 99,288.09 × 18,816.20
  4. Step 4: Simplify right side
    66,198.90x = 1,868,223,968.54
  5. Step 5: Solve for x
    x = 1,868,223,968.54/66,198.90
  6. Step 6: Final answer
    x = 28,221.37

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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.