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Finding the Fourth Proportional to 138,215.78, 190,796.63 and 92,920.03

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Solution

The fourth proportional to 138,215.78, 190,796.63 and 92,920.03 is: 128,269.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,215.78 : 190,796.63 = 92,920.03 : x
  2. Step 2: Convert to fraction form
    138,215.78/190,796.63 = 92,920.03/x
  3. Step 3: Cross multiply
    138,215.78x = 190,796.63 × 92,920.03
  4. Step 4: Simplify right side
    138,215.78x = 17,728,828,357.39
  5. Step 5: Solve for x
    x = 17,728,828,357.39/138,215.78
  6. Step 6: Final answer
    x = 128,269.21

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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.