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Finding the Fourth Proportional to 128,077.86, 192,116.79 and 43,839.12

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Solution

The fourth proportional to 128,077.86, 192,116.79 and 43,839.12 is: 65,758.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,077.86 : 192,116.79 = 43,839.12 : x
  2. Step 2: Convert to fraction form
    128,077.86/192,116.79 = 43,839.12/x
  3. Step 3: Cross multiply
    128,077.86x = 192,116.79 × 43,839.12
  4. Step 4: Simplify right side
    128,077.86x = 8,422,231,010.82
  5. Step 5: Solve for x
    x = 8,422,231,010.82/128,077.86
  6. Step 6: Final answer
    x = 65,758.68

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1.5x scale

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.