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Finding the Fourth Proportional to 128,913.12, 193,379.00 and 53,957.88

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Solution

The fourth proportional to 128,913.12, 193,379.00 and 53,957.88 is: 80,940.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,913.12 : 193,379.00 = 53,957.88 : x
  2. Step 2: Convert to fraction form
    128,913.12/193,379.00 = 53,957.88/x
  3. Step 3: Cross multiply
    128,913.12x = 193,379.00 × 53,957.88
  4. Step 4: Simplify right side
    128,913.12x = 10,434,320,606.73
  5. Step 5: Solve for x
    x = 10,434,320,606.73/128,913.12
  6. Step 6: Final answer
    x = 80,940.72

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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.