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Finding the Fourth Proportional to 128,766.80, 192,712.80 and 113,020.40

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Solution

The fourth proportional to 128,766.80, 192,712.80 and 113,020.40 is: 169,146.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,766.80 : 192,712.80 = 113,020.40 : x
  2. Step 2: Convert to fraction form
    128,766.80/192,712.80 = 113,020.40/x
  3. Step 3: Cross multiply
    128,766.80x = 192,712.80 × 113,020.40
  4. Step 4: Simplify right side
    128,766.80x = 21,780,477,741.12
  5. Step 5: Solve for x
    x = 21,780,477,741.12/128,766.80
  6. Step 6: Final answer
    x = 169,146.69

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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.