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Finding the Fourth Proportional to 149,863.55, 206,809.29 and 81,879.07

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Solution

The fourth proportional to 149,863.55, 206,809.29 and 81,879.07 is: 112,991.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    149,863.55 : 206,809.29 = 81,879.07 : x
  2. Step 2: Convert to fraction form
    149,863.55/206,809.29 = 81,879.07/x
  3. Step 3: Cross multiply
    149,863.55x = 206,809.29 × 81,879.07
  4. Step 4: Simplify right side
    149,863.55x = 16,933,351,621.65
  5. Step 5: Solve for x
    x = 16,933,351,621.65/149,863.55
  6. Step 6: Final answer
    x = 112,991.79

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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.