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Finding the Fourth Proportional to 127,919.20, 192,051.60 and 81,263.20

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Solution

The fourth proportional to 127,919.20, 192,051.60 and 81,263.20 is: 122,004.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,919.20 : 192,051.60 = 81,263.20 : x
  2. Step 2: Convert to fraction form
    127,919.20/192,051.60 = 81,263.20/x
  3. Step 3: Cross multiply
    127,919.20x = 192,051.60 × 81,263.20
  4. Step 4: Simplify right side
    127,919.20x = 15,606,727,581.12
  5. Step 5: Solve for x
    x = 15,606,727,581.12/127,919.20
  6. Step 6: Final answer
    x = 122,004.57

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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.