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Finding the Fourth Proportional to 121,708.87, 167,954.90 and 66,515.97

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Solution

The fourth proportional to 121,708.87, 167,954.90 and 66,515.97 is: 91,790.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,708.87 : 167,954.90 = 66,515.97 : x
  2. Step 2: Convert to fraction form
    121,708.87/167,954.90 = 66,515.97/x
  3. Step 3: Cross multiply
    121,708.87x = 167,954.90 × 66,515.97
  4. Step 4: Simplify right side
    121,708.87x = 11,171,683,089.75
  5. Step 5: Solve for x
    x = 11,171,683,089.75/121,708.87
  6. Step 6: Final answer
    x = 91,790.21

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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.