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Finding the Fourth Proportional to 205,965.20, 308,947.80 and 100,989.20

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Solution

The fourth proportional to 205,965.20, 308,947.80 and 100,989.20 is: 151,483.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,965.20 : 308,947.80 = 100,989.20 : x
  2. Step 2: Convert to fraction form
    205,965.20/308,947.80 = 100,989.20/x
  3. Step 3: Cross multiply
    205,965.20x = 308,947.80 × 100,989.20
  4. Step 4: Simplify right side
    205,965.20x = 31,200,391,163.76
  5. Step 5: Solve for x
    x = 31,200,391,163.76/205,965.20
  6. Step 6: Final answer
    x = 151,483.80

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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.