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Finding the Fourth Proportional to 128,911.70, 192,820.80 and 115,680.35

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Solution

The fourth proportional to 128,911.70, 192,820.80 and 115,680.35 is: 173,029.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,911.70 : 192,820.80 = 115,680.35 : x
  2. Step 2: Convert to fraction form
    128,911.70/192,820.80 = 115,680.35/x
  3. Step 3: Cross multiply
    128,911.70x = 192,820.80 × 115,680.35
  4. Step 4: Simplify right side
    128,911.70x = 22,305,577,631.28
  5. Step 5: Solve for x
    x = 22,305,577,631.28/128,911.70
  6. Step 6: Final answer
    x = 173,029.89

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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.