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Finding the Fourth Proportional to 128,913.96, 193,380.26 and 53,958.69

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Solution

The fourth proportional to 128,913.96, 193,380.26 and 53,958.69 is: 80,941.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,913.96 : 193,380.26 = 53,958.69 : x
  2. Step 2: Convert to fraction form
    128,913.96/193,380.26 = 53,958.69/x
  3. Step 3: Cross multiply
    128,913.96x = 193,380.26 × 53,958.69
  4. Step 4: Simplify right side
    128,913.96x = 10,434,545,535.18
  5. Step 5: Solve for x
    x = 10,434,545,535.18/128,913.96
  6. Step 6: Final answer
    x = 80,941.93

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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.