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Finding the Fourth Proportional to 128,994.88, 193,428.88 and 75,790.48

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Solution

The fourth proportional to 128,994.88, 193,428.88 and 75,790.48 is: 113,648.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,994.88 : 193,428.88 = 75,790.48 : x
  2. Step 2: Convert to fraction form
    128,994.88/193,428.88 = 75,790.48/x
  3. Step 3: Cross multiply
    128,994.88x = 193,428.88 × 75,790.48
  4. Step 4: Simplify right side
    128,994.88x = 14,660,067,661.06
  5. Step 5: Solve for x
    x = 14,660,067,661.06/128,994.88
  6. Step 6: Final answer
    x = 113,648.45

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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.