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Finding the Fourth Proportional to 137,661.80, 206,614.20 and 81,431.60

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Solution

The fourth proportional to 137,661.80, 206,614.20 and 81,431.60 is: 122,219.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,661.80 : 206,614.20 = 81,431.60 : x
  2. Step 2: Convert to fraction form
    137,661.80/206,614.20 = 81,431.60/x
  3. Step 3: Cross multiply
    137,661.80x = 206,614.20 × 81,431.60
  4. Step 4: Simplify right side
    137,661.80x = 16,824,924,888.72
  5. Step 5: Solve for x
    x = 16,824,924,888.72/137,661.80
  6. Step 6: Final answer
    x = 122,219.27

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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.