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Finding the Fourth Proportional to 128,687.73, 193,034.40 and 90,581.28

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Solution

The fourth proportional to 128,687.73, 193,034.40 and 90,581.28 is: 135,873.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,687.73 : 193,034.40 = 90,581.28 : x
  2. Step 2: Convert to fraction form
    128,687.73/193,034.40 = 90,581.28/x
  3. Step 3: Cross multiply
    128,687.73x = 193,034.40 × 90,581.28
  4. Step 4: Simplify right side
    128,687.73x = 17,485,303,036.03
  5. Step 5: Solve for x
    x = 17,485,303,036.03/128,687.73
  6. Step 6: Final answer
    x = 135,873.89

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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.