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Finding the Fourth Proportional to 121,394.90, 167,465.42 and 81,118.56

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Solution

The fourth proportional to 121,394.90, 167,465.42 and 81,118.56 is: 111,903.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,394.90 : 167,465.42 = 81,118.56 : x
  2. Step 2: Convert to fraction form
    121,394.90/167,465.42 = 81,118.56/x
  3. Step 3: Cross multiply
    121,394.90x = 167,465.42 × 81,118.56
  4. Step 4: Simplify right side
    121,394.90x = 13,584,554,703.08
  5. Step 5: Solve for x
    x = 13,584,554,703.08/121,394.90
  6. Step 6: Final answer
    x = 111,903.83

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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.