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Finding the Fourth Proportional to 128,309.60, 192,099.90 and 121,327.40

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Solution

The fourth proportional to 128,309.60, 192,099.90 and 121,327.40 is: 181,646.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,309.60 : 192,099.90 = 121,327.40 : x
  2. Step 2: Convert to fraction form
    128,309.60/192,099.90 = 121,327.40/x
  3. Step 3: Cross multiply
    128,309.60x = 192,099.90 × 121,327.40
  4. Step 4: Simplify right side
    128,309.60x = 23,306,981,407.26
  5. Step 5: Solve for x
    x = 23,306,981,407.26/128,309.60
  6. Step 6: Final answer
    x = 181,646.43

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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.