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Finding the Fourth Proportional to 205,712.40, 308,568.60 and 72,591.60

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Solution

The fourth proportional to 205,712.40, 308,568.60 and 72,591.60 is: 108,887.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,712.40 : 308,568.60 = 72,591.60 : x
  2. Step 2: Convert to fraction form
    205,712.40/308,568.60 = 72,591.60/x
  3. Step 3: Cross multiply
    205,712.40x = 308,568.60 × 72,591.60
  4. Step 4: Simplify right side
    205,712.40x = 22,399,488,383.76
  5. Step 5: Solve for x
    x = 22,399,488,383.76/205,712.40
  6. Step 6: Final answer
    x = 108,887.40

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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.