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Finding the Fourth Proportional to 128,239.80, 192,129.30 and 109,807.80

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Solution

The fourth proportional to 128,239.80, 192,129.30 and 109,807.80 is: 164,514.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,239.80 : 192,129.30 = 109,807.80 : x
  2. Step 2: Convert to fraction form
    128,239.80/192,129.30 = 109,807.80/x
  3. Step 3: Cross multiply
    128,239.80x = 192,129.30 × 109,807.80
  4. Step 4: Simplify right side
    128,239.80x = 21,097,295,748.54
  5. Step 5: Solve for x
    x = 21,097,295,748.54/128,239.80
  6. Step 6: Final answer
    x = 164,514.42

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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.