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Finding the Fourth Proportional to 128,514.89, 192,771.72 and 85,729.88

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Solution

The fourth proportional to 128,514.89, 192,771.72 and 85,729.88 is: 128,594.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,514.89 : 192,771.72 = 85,729.88 : x
  2. Step 2: Convert to fraction form
    128,514.89/192,771.72 = 85,729.88/x
  3. Step 3: Cross multiply
    128,514.89x = 192,771.72 × 85,729.88
  4. Step 4: Simplify right side
    128,514.89x = 16,526,295,459.14
  5. Step 5: Solve for x
    x = 16,526,295,459.14/128,514.89
  6. Step 6: Final answer
    x = 128,594.41

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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.