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Finding the Fourth Proportional to 138,665.96, 191,361.56 and 81,346.41

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Solution

The fourth proportional to 138,665.96, 191,361.56 and 81,346.41 is: 112,259.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,665.96 : 191,361.56 = 81,346.41 : x
  2. Step 2: Convert to fraction form
    138,665.96/191,361.56 = 81,346.41/x
  3. Step 3: Cross multiply
    138,665.96x = 191,361.56 × 81,346.41
  4. Step 4: Simplify right side
    138,665.96x = 15,566,575,511.27
  5. Step 5: Solve for x
    x = 15,566,575,511.27/138,665.96
  6. Step 6: Final answer
    x = 112,259.53

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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.