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Finding the Fourth Proportional to 138,551.92, 191,203.77 and 81,177.51

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Solution

The fourth proportional to 138,551.92, 191,203.77 and 81,177.51 is: 112,026.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,551.92 : 191,203.77 = 81,177.51 : x
  2. Step 2: Convert to fraction form
    138,551.92/191,203.77 = 81,177.51/x
  3. Step 3: Cross multiply
    138,551.92x = 191,203.77 × 81,177.51
  4. Step 4: Simplify right side
    138,551.92x = 15,521,445,897.12
  5. Step 5: Solve for x
    x = 15,521,445,897.12/138,551.92
  6. Step 6: Final answer
    x = 112,026.21

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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.