Home / 128,380.29-192,588.89-39,640.65

Finding the Fourth Proportional to 128,380.29, 192,588.89 and 39,640.65

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Solution

The fourth proportional to 128,380.29, 192,588.89 and 39,640.65 is: 59,466.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,380.29 : 192,588.89 = 39,640.65 : x
  2. Step 2: Convert to fraction form
    128,380.29/192,588.89 = 39,640.65/x
  3. Step 3: Cross multiply
    128,380.29x = 192,588.89 × 39,640.65
  4. Step 4: Simplify right side
    128,380.29x = 7,634,348,584.18
  5. Step 5: Solve for x
    x = 7,634,348,584.18/128,380.29
  6. Step 6: Final answer
    x = 59,466.67

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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.