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Finding the Fourth Proportional to 128,687.45, 193,028.43 and 35,193.20

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Solution

The fourth proportional to 128,687.45, 193,028.43 and 35,193.20 is: 52,789.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,687.45 : 193,028.43 = 35,193.20 : x
  2. Step 2: Convert to fraction form
    128,687.45/193,028.43 = 35,193.20/x
  3. Step 3: Cross multiply
    128,687.45x = 193,028.43 × 35,193.20
  4. Step 4: Simplify right side
    128,687.45x = 6,793,287,309.51
  5. Step 5: Solve for x
    x = 6,793,287,309.51/128,687.45
  6. Step 6: Final answer
    x = 52,789.04

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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.