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Finding the Fourth Proportional to 128,729.82, 193,107.21 and 39,959.49

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Solution

The fourth proportional to 128,729.82, 193,107.21 and 39,959.49 is: 59,943.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,729.82 : 193,107.21 = 39,959.49 : x
  2. Step 2: Convert to fraction form
    128,729.82/193,107.21 = 39,959.49/x
  3. Step 3: Cross multiply
    128,729.82x = 193,107.21 × 39,959.49
  4. Step 4: Simplify right side
    128,729.82x = 7,716,466,201.23
  5. Step 5: Solve for x
    x = 7,716,466,201.23/128,729.82
  6. Step 6: Final answer
    x = 59,943.11

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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.