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Finding the Fourth Proportional to 128,843.73, 177,884.10 and 85,883.76

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Solution

The fourth proportional to 128,843.73, 177,884.10 and 85,883.76 is: 118,572.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,843.73 : 177,884.10 = 85,883.76 : x
  2. Step 2: Convert to fraction form
    128,843.73/177,884.10 = 85,883.76/x
  3. Step 3: Cross multiply
    128,843.73x = 177,884.10 × 85,883.76
  4. Step 4: Simplify right side
    128,843.73x = 15,277,355,352.22
  5. Step 5: Solve for x
    x = 15,277,355,352.22/128,843.73
  6. Step 6: Final answer
    x = 118,572.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.