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Finding the Fourth Proportional to 205,786.40, 308,679.60 and 72,665.60

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Solution

The fourth proportional to 205,786.40, 308,679.60 and 72,665.60 is: 108,998.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,786.40 : 308,679.60 = 72,665.60 : x
  2. Step 2: Convert to fraction form
    205,786.40/308,679.60 = 72,665.60/x
  3. Step 3: Cross multiply
    205,786.40x = 308,679.60 × 72,665.60
  4. Step 4: Simplify right side
    205,786.40x = 22,430,388,341.76
  5. Step 5: Solve for x
    x = 22,430,388,341.76/205,786.40
  6. Step 6: Final answer
    x = 108,998.40

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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.