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Finding the Fourth Proportional to 128,319.88, 192,513.03 and 39,571.42

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Solution

The fourth proportional to 128,319.88, 192,513.03 and 39,571.42 is: 59,367.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,319.88 : 192,513.03 = 39,571.42 : x
  2. Step 2: Convert to fraction form
    128,319.88/192,513.03 = 39,571.42/x
  3. Step 3: Cross multiply
    128,319.88x = 192,513.03 × 39,571.42
  4. Step 4: Simplify right side
    128,319.88x = 7,618,013,965.60
  5. Step 5: Solve for x
    x = 7,618,013,965.60/128,319.88
  6. Step 6: Final answer
    x = 59,367.37

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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.