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Finding the Fourth Proportional to 138,311.80, 207,467.70 and 136,999.60

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Solution

The fourth proportional to 138,311.80, 207,467.70 and 136,999.60 is: 205,499.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,311.80 : 207,467.70 = 136,999.60 : x
  2. Step 2: Convert to fraction form
    138,311.80/207,467.70 = 136,999.60/x
  3. Step 3: Cross multiply
    138,311.80x = 207,467.70 × 136,999.60
  4. Step 4: Simplify right side
    138,311.80x = 28,422,991,912.92
  5. Step 5: Solve for x
    x = 28,422,991,912.92/138,311.80
  6. Step 6: Final answer
    x = 205,499.40

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Similar ratio
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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.