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Finding the Fourth Proportional to 128,930.37, 193,404.87 and 53,975.13

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Solution

The fourth proportional to 128,930.37, 193,404.87 and 53,975.13 is: 80,966.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,930.37 : 193,404.87 = 53,975.13 : x
  2. Step 2: Convert to fraction form
    128,930.37/193,404.87 = 53,975.13/x
  3. Step 3: Cross multiply
    128,930.37x = 193,404.87 × 53,975.13
  4. Step 4: Simplify right side
    128,930.37x = 10,439,053,000.88
  5. Step 5: Solve for x
    x = 10,439,053,000.88/128,930.37
  6. Step 6: Final answer
    x = 80,966.59

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1.5x scale

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.