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Finding the Fourth Proportional to 127,918.70, 192,050.85 and 81,262.70

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Solution

The fourth proportional to 127,918.70, 192,050.85 and 81,262.70 is: 122,003.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,918.70 : 192,050.85 = 81,262.70 : x
  2. Step 2: Convert to fraction form
    127,918.70/192,050.85 = 81,262.70/x
  3. Step 3: Cross multiply
    127,918.70x = 192,050.85 × 81,262.70
  4. Step 4: Simplify right side
    127,918.70x = 15,606,570,608.30
  5. Step 5: Solve for x
    x = 15,606,570,608.30/127,918.70
  6. Step 6: Final answer
    x = 122,003.82

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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.