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Finding the Fourth Proportional to 128,308.80, 192,505.92 and 80,869.14

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Solution

The fourth proportional to 128,308.80, 192,505.92 and 80,869.14 is: 121,330.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,308.80 : 192,505.92 = 80,869.14 : x
  2. Step 2: Convert to fraction form
    128,308.80/192,505.92 = 80,869.14/x
  3. Step 3: Cross multiply
    128,308.80x = 192,505.92 × 80,869.14
  4. Step 4: Simplify right side
    128,308.80x = 15,567,788,195.31
  5. Step 5: Solve for x
    x = 15,567,788,195.31/128,308.80
  6. Step 6: Final answer
    x = 121,330.64

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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.