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Finding the Fourth Proportional to 128,618.67, 192,920.54 and 38,659.44

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Solution

The fourth proportional to 128,618.67, 192,920.54 and 38,659.44 is: 57,986.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,618.67 : 192,920.54 = 38,659.44 : x
  2. Step 2: Convert to fraction form
    128,618.67/192,920.54 = 38,659.44/x
  3. Step 3: Cross multiply
    128,618.67x = 192,920.54 × 38,659.44
  4. Step 4: Simplify right side
    128,618.67x = 7,458,199,847.60
  5. Step 5: Solve for x
    x = 7,458,199,847.60/128,618.67
  6. Step 6: Final answer
    x = 57,986.91

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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.