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Finding the Fourth Proportional to 121,709.34, 167,955.60 and 66,516.48

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Solution

The fourth proportional to 121,709.34, 167,955.60 and 66,516.48 is: 91,790.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,709.34 : 167,955.60 = 66,516.48 : x
  2. Step 2: Convert to fraction form
    121,709.34/167,955.60 = 66,516.48/x
  3. Step 3: Cross multiply
    121,709.34x = 167,955.60 × 66,516.48
  4. Step 4: Simplify right side
    121,709.34x = 11,171,815,308.29
  5. Step 5: Solve for x
    x = 11,171,815,308.29/121,709.34
  6. Step 6: Final answer
    x = 91,790.94

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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.