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Finding the Fourth Proportional to 128,712.78, 193,069.35 and 53,791.97

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Solution

The fourth proportional to 128,712.78, 193,069.35 and 53,791.97 is: 80,688.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,712.78 : 193,069.35 = 53,791.97 : x
  2. Step 2: Convert to fraction form
    128,712.78/193,069.35 = 53,791.97/x
  3. Step 3: Cross multiply
    128,712.78x = 193,069.35 × 53,791.97
  4. Step 4: Simplify right side
    128,712.78x = 10,385,579,717.77
  5. Step 5: Solve for x
    x = 10,385,579,717.77/128,712.78
  6. Step 6: Final answer
    x = 80,688.02

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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.