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Finding the Fourth Proportional to 205,910.40, 308,865.60 and 72,789.60

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Solution

The fourth proportional to 205,910.40, 308,865.60 and 72,789.60 is: 109,184.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,910.40 : 308,865.60 = 72,789.60 : x
  2. Step 2: Convert to fraction form
    205,910.40/308,865.60 = 72,789.60/x
  3. Step 3: Cross multiply
    205,910.40x = 308,865.60 × 72,789.60
  4. Step 4: Simplify right side
    205,910.40x = 22,482,203,477.76
  5. Step 5: Solve for x
    x = 22,482,203,477.76/205,910.40
  6. Step 6: Final answer
    x = 109,184.40

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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.