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Finding the Fourth Proportional to 128,940.93, 193,410.86 and 72,755.46

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Solution

The fourth proportional to 128,940.93, 193,410.86 and 72,755.46 is: 109,132.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,940.93 : 193,410.86 = 72,755.46 : x
  2. Step 2: Convert to fraction form
    128,940.93/193,410.86 = 72,755.46/x
  3. Step 3: Cross multiply
    128,940.93x = 193,410.86 × 72,755.46
  4. Step 4: Simplify right side
    128,940.93x = 14,071,695,724.52
  5. Step 5: Solve for x
    x = 14,071,695,724.52/128,940.93
  6. Step 6: Final answer
    x = 109,132.89

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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.