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Finding the Fourth Proportional to 121,438, 167,606.32 and 71,137

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Solution

The fourth proportional to 121,438, 167,606.32 and 71,137 is: 98,181.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,438 : 167,606.32 = 71,137 : x
  2. Step 2: Convert to fraction form
    121,438/167,606.32 = 71,137/x
  3. Step 3: Cross multiply
    121,438x = 167,606.32 × 71,137
  4. Step 4: Simplify right side
    121,438x = 11,923,010,785.84
  5. Step 5: Solve for x
    x = 11,923,010,785.84/121,438
  6. Step 6: Final answer
    x = 98,181.88

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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.