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Finding the Fourth Proportional to 206,860.60, 309,999.30 and 127,739.80

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Solution

The fourth proportional to 206,860.60, 309,999.30 and 127,739.80 is: 191,429.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,860.60 : 309,999.30 = 127,739.80 : x
  2. Step 2: Convert to fraction form
    206,860.60/309,999.30 = 127,739.80/x
  3. Step 3: Cross multiply
    206,860.60x = 309,999.30 × 127,739.80
  4. Step 4: Simplify right side
    206,860.60x = 39,599,248,582.14
  5. Step 5: Solve for x
    x = 39,599,248,582.14/206,860.60
  6. Step 6: Final answer
    x = 191,429.63

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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.