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Finding the Fourth Proportional to 128,986.88, 193,555.02 and 54,100.34

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Solution

The fourth proportional to 128,986.88, 193,555.02 and 54,100.34 is: 81,181.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,986.88 : 193,555.02 = 54,100.34 : x
  2. Step 2: Convert to fraction form
    128,986.88/193,555.02 = 54,100.34/x
  3. Step 3: Cross multiply
    128,986.88x = 193,555.02 × 54,100.34
  4. Step 4: Simplify right side
    128,986.88x = 10,471,392,390.71
  5. Step 5: Solve for x
    x = 10,471,392,390.71/128,986.88
  6. Step 6: Final answer
    x = 81,181.84

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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.