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Finding the Fourth Proportional to 139,991.80, 209,987.70 and 123,662.20

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Solution

The fourth proportional to 139,991.80, 209,987.70 and 123,662.20 is: 185,493.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,991.80 : 209,987.70 = 123,662.20 : x
  2. Step 2: Convert to fraction form
    139,991.80/209,987.70 = 123,662.20/x
  3. Step 3: Cross multiply
    139,991.80x = 209,987.70 × 123,662.20
  4. Step 4: Simplify right side
    139,991.80x = 25,967,540,954.94
  5. Step 5: Solve for x
    x = 25,967,540,954.94/139,991.80
  6. Step 6: Final answer
    x = 185,493.30

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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.