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Finding the Fourth Proportional to 128,323.50, 177,083.19 and 71,735.28

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Solution

The fourth proportional to 128,323.50, 177,083.19 and 71,735.28 is: 98,992.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,323.50 : 177,083.19 = 71,735.28 : x
  2. Step 2: Convert to fraction form
    128,323.50/177,083.19 = 71,735.28/x
  3. Step 3: Cross multiply
    128,323.50x = 177,083.19 × 71,735.28
  4. Step 4: Simplify right side
    128,323.50x = 12,703,112,217.94
  5. Step 5: Solve for x
    x = 12,703,112,217.94/128,323.50
  6. Step 6: Final answer
    x = 98,992.88

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1.5x scale

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.