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Finding the Fourth Proportional to 138,913.18, 191,696.22 and 81,551.56

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Solution

The fourth proportional to 138,913.18, 191,696.22 and 81,551.56 is: 112,538.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,913.18 : 191,696.22 = 81,551.56 : x
  2. Step 2: Convert to fraction form
    138,913.18/191,696.22 = 81,551.56/x
  3. Step 3: Cross multiply
    138,913.18x = 191,696.22 × 81,551.56
  4. Step 4: Simplify right side
    138,913.18x = 15,633,125,787.10
  5. Step 5: Solve for x
    x = 15,633,125,787.10/138,913.18
  6. Step 6: Final answer
    x = 112,538.82

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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.