Home / 128,492.20-192,738.30-81,778.60

Finding the Fourth Proportional to 128,492.20, 192,738.30 and 81,778.60

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Solution

The fourth proportional to 128,492.20, 192,738.30 and 81,778.60 is: 122,667.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,492.20 : 192,738.30 = 81,778.60 : x
  2. Step 2: Convert to fraction form
    128,492.20/192,738.30 = 81,778.60/x
  3. Step 3: Cross multiply
    128,492.20x = 192,738.30 × 81,778.60
  4. Step 4: Simplify right side
    128,492.20x = 15,761,868,340.38
  5. Step 5: Solve for x
    x = 15,761,868,340.38/128,492.20
  6. Step 6: Final answer
    x = 122,667.90

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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.