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Finding the Fourth Proportional to 138,863.43, 191,629.96 and 81,492.49

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Solution

The fourth proportional to 138,863.43, 191,629.96 and 81,492.49 is: 112,458.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,863.43 : 191,629.96 = 81,492.49 : x
  2. Step 2: Convert to fraction form
    138,863.43/191,629.96 = 81,492.49/x
  3. Step 3: Cross multiply
    138,863.43x = 191,629.96 × 81,492.49
  4. Step 4: Simplify right side
    138,863.43x = 15,616,402,599.00
  5. Step 5: Solve for x
    x = 15,616,402,599.00/138,863.43
  6. Step 6: Final answer
    x = 112,458.71

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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.