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Finding the Fourth Proportional to 121,435, 167,602.17 and 71,134

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Solution

The fourth proportional to 121,435, 167,602.17 and 71,134 is: 98,177.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,435 : 167,602.17 = 71,134 : x
  2. Step 2: Convert to fraction form
    121,435/167,602.17 = 71,134/x
  3. Step 3: Cross multiply
    121,435x = 167,602.17 × 71,134
  4. Step 4: Simplify right side
    121,435x = 11,922,212,760.78
  5. Step 5: Solve for x
    x = 11,922,212,760.78/121,435
  6. Step 6: Final answer
    x = 98,177.73

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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.