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Finding the Fourth Proportional to 128,510.15, 192,819.90 and 81,161.60

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Solution

The fourth proportional to 128,510.15, 192,819.90 and 81,161.60 is: 121,776.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,510.15 : 192,819.90 = 81,161.60 : x
  2. Step 2: Convert to fraction form
    128,510.15/192,819.90 = 81,161.60/x
  3. Step 3: Cross multiply
    128,510.15x = 192,819.90 × 81,161.60
  4. Step 4: Simplify right side
    128,510.15x = 15,649,571,595.84
  5. Step 5: Solve for x
    x = 15,649,571,595.84/128,510.15
  6. Step 6: Final answer
    x = 121,776.93

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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.