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Finding the Fourth Proportional to 128,810.20, 192,956.10 and 86,819.80

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Solution

The fourth proportional to 128,810.20, 192,956.10 and 86,819.80 is: 130,055.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,810.20 : 192,956.10 = 86,819.80 : x
  2. Step 2: Convert to fraction form
    128,810.20/192,956.10 = 86,819.80/x
  3. Step 3: Cross multiply
    128,810.20x = 192,956.10 × 86,819.80
  4. Step 4: Simplify right side
    128,810.20x = 16,752,410,010.78
  5. Step 5: Solve for x
    x = 16,752,410,010.78/128,810.20
  6. Step 6: Final answer
    x = 130,055.00

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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.