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Finding the Fourth Proportional to 121,516.58, 167,672.76 and 81,165.62

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Solution

The fourth proportional to 121,516.58, 167,672.76 and 81,165.62 is: 111,995.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,516.58 : 167,672.76 = 81,165.62 : x
  2. Step 2: Convert to fraction form
    121,516.58/167,672.76 = 81,165.62/x
  3. Step 3: Cross multiply
    121,516.58x = 167,672.76 × 81,165.62
  4. Step 4: Simplify right side
    121,516.58x = 13,609,263,522.51
  5. Step 5: Solve for x
    x = 13,609,263,522.51/121,516.58
  6. Step 6: Final answer
    x = 111,995.12

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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.