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Finding the Fourth Proportional to 128,063.50, 191,619.50 and 80,455.70

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Solution

The fourth proportional to 128,063.50, 191,619.50 and 80,455.70 is: 120,384.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,063.50 : 191,619.50 = 80,455.70 : x
  2. Step 2: Convert to fraction form
    128,063.50/191,619.50 = 80,455.70/x
  3. Step 3: Cross multiply
    128,063.50x = 191,619.50 × 80,455.70
  4. Step 4: Simplify right side
    128,063.50x = 15,416,879,645.77
  5. Step 5: Solve for x
    x = 15,416,879,645.77/128,063.50
  6. Step 6: Final answer
    x = 120,384.65

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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.