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Finding the Fourth Proportional to 127,879.20, 191,905.20 and 71,719.20

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Solution

The fourth proportional to 127,879.20, 191,905.20 and 71,719.20 is: 107,627.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,879.20 : 191,905.20 = 71,719.20 : x
  2. Step 2: Convert to fraction form
    127,879.20/191,905.20 = 71,719.20/x
  3. Step 3: Cross multiply
    127,879.20x = 191,905.20 × 71,719.20
  4. Step 4: Simplify right side
    127,879.20x = 13,763,287,419.84
  5. Step 5: Solve for x
    x = 13,763,287,419.84/127,879.20
  6. Step 6: Final answer
    x = 107,627.26

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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.