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Finding the Fourth Proportional to 128,659.14, 192,861 and 61,072.74

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Solution

The fourth proportional to 128,659.14, 192,861 and 61,072.74 is: 91,548.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,659.14 : 192,861 = 61,072.74 : x
  2. Step 2: Convert to fraction form
    128,659.14/192,861 = 61,072.74/x
  3. Step 3: Cross multiply
    128,659.14x = 192,861 × 61,072.74
  4. Step 4: Simplify right side
    128,659.14x = 11,778,549,709.14
  5. Step 5: Solve for x
    x = 11,778,549,709.14/128,659.14
  6. Step 6: Final answer
    x = 91,548.49

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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.