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Finding the Fourth Proportional to 121,817.53, 168,109.39 and 68,105.49

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Solution

The fourth proportional to 121,817.53, 168,109.39 and 68,105.49 is: 93,986.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,817.53 : 168,109.39 = 68,105.49 : x
  2. Step 2: Convert to fraction form
    121,817.53/168,109.39 = 68,105.49/x
  3. Step 3: Cross multiply
    121,817.53x = 168,109.39 × 68,105.49
  4. Step 4: Simplify right side
    121,817.53x = 11,449,172,379.55
  5. Step 5: Solve for x
    x = 11,449,172,379.55/121,817.53
  6. Step 6: Final answer
    x = 93,986.25

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1.5x scale

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.