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Finding the Fourth Proportional to 127,980.80, 191,726.40 and 68,796.80

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Solution

The fourth proportional to 127,980.80, 191,726.40 and 68,796.80 is: 103,063.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,980.80 : 191,726.40 = 68,796.80 : x
  2. Step 2: Convert to fraction form
    127,980.80/191,726.40 = 68,796.80/x
  3. Step 3: Cross multiply
    127,980.80x = 191,726.40 × 68,796.80
  4. Step 4: Simplify right side
    127,980.80x = 13,190,162,795.52
  5. Step 5: Solve for x
    x = 13,190,162,795.52/127,980.80
  6. Step 6: Final answer
    x = 103,063.61

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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.