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Finding the Fourth Proportional to 138,603.94, 191,237.29 and 81,212.42

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Solution

The fourth proportional to 138,603.94, 191,237.29 and 81,212.42 is: 112,051.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,603.94 : 191,237.29 = 81,212.42 : x
  2. Step 2: Convert to fraction form
    138,603.94/191,237.29 = 81,212.42/x
  3. Step 3: Cross multiply
    138,603.94x = 191,237.29 × 81,212.42
  4. Step 4: Simplify right side
    138,603.94x = 15,530,843,115.14
  5. Step 5: Solve for x
    x = 15,530,843,115.14/138,603.94
  6. Step 6: Final answer
    x = 112,051.96

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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.