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Finding the Fourth Proportional to 138,739.80, 208,109.70 and 49,996.20

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Solution

The fourth proportional to 138,739.80, 208,109.70 and 49,996.20 is: 74,994.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,739.80 : 208,109.70 = 49,996.20 : x
  2. Step 2: Convert to fraction form
    138,739.80/208,109.70 = 49,996.20/x
  3. Step 3: Cross multiply
    138,739.80x = 208,109.70 × 49,996.20
  4. Step 4: Simplify right side
    138,739.80x = 10,404,694,183.14
  5. Step 5: Solve for x
    x = 10,404,694,183.14/138,739.80
  6. Step 6: Final answer
    x = 74,994.30

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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.