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Finding the Fourth Proportional to 121,955.12, 168,096.76 and 81,654.64

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Solution

The fourth proportional to 121,955.12, 168,096.76 and 81,654.64 is: 112,548.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,955.12 : 168,096.76 = 81,654.64 : x
  2. Step 2: Convert to fraction form
    121,955.12/168,096.76 = 81,654.64/x
  3. Step 3: Cross multiply
    121,955.12x = 168,096.76 × 81,654.64
  4. Step 4: Simplify right side
    121,955.12x = 13,725,880,422.97
  5. Step 5: Solve for x
    x = 13,725,880,422.97/121,955.12
  6. Step 6: Final answer
    x = 112,548.62

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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.