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Finding the Fourth Proportional to 128,302, 177,059.96 and 71,722.80

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Solution

The fourth proportional to 128,302, 177,059.96 and 71,722.80 is: 98,979.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,302 : 177,059.96 = 71,722.80 : x
  2. Step 2: Convert to fraction form
    128,302/177,059.96 = 71,722.80/x
  3. Step 3: Cross multiply
    128,302x = 177,059.96 × 71,722.80
  4. Step 4: Simplify right side
    128,302x = 12,699,236,099.09
  5. Step 5: Solve for x
    x = 12,699,236,099.09/128,302
  6. Step 6: Final answer
    x = 98,979.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.