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Finding the Fourth Proportional to 138,216.78, 190,798.01 and 92,921.03

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Solution

The fourth proportional to 138,216.78, 190,798.01 and 92,921.03 is: 128,270.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,216.78 : 190,798.01 = 92,921.03 : x
  2. Step 2: Convert to fraction form
    138,216.78/190,798.01 = 92,921.03/x
  3. Step 3: Cross multiply
    138,216.78x = 190,798.01 × 92,921.03
  4. Step 4: Simplify right side
    138,216.78x = 17,729,147,611.15
  5. Step 5: Solve for x
    x = 17,729,147,611.15/138,216.78
  6. Step 6: Final answer
    x = 128,270.59

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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.