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Finding the Fourth Proportional to 128,871.43, 193,334.96 and 38,906.68

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Solution

The fourth proportional to 128,871.43, 193,334.96 and 38,906.68 is: 58,368.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,871.43 : 193,334.96 = 38,906.68 : x
  2. Step 2: Convert to fraction form
    128,871.43/193,334.96 = 38,906.68/x
  3. Step 3: Cross multiply
    128,871.43x = 193,334.96 × 38,906.68
  4. Step 4: Simplify right side
    128,871.43x = 7,522,021,468.67
  5. Step 5: Solve for x
    x = 7,522,021,468.67/128,871.43
  6. Step 6: Final answer
    x = 58,368.42

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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.