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Finding the Fourth Proportional to 128,491.83, 192,824.96 and 45,385.83

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Solution

The fourth proportional to 128,491.83, 192,824.96 and 45,385.83 is: 68,109.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,491.83 : 192,824.96 = 45,385.83 : x
  2. Step 2: Convert to fraction form
    128,491.83/192,824.96 = 45,385.83/x
  3. Step 3: Cross multiply
    128,491.83x = 192,824.96 × 45,385.83
  4. Step 4: Simplify right side
    128,491.83x = 8,751,520,627.39
  5. Step 5: Solve for x
    x = 8,751,520,627.39/128,491.83
  6. Step 6: Final answer
    x = 68,109.55

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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.