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Finding the Fourth Proportional to 121,911.75, 168,241.59 and 68,206.05

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Solution

The fourth proportional to 121,911.75, 168,241.59 and 68,206.05 is: 94,126.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,911.75 : 168,241.59 = 68,206.05 : x
  2. Step 2: Convert to fraction form
    121,911.75/168,241.59 = 68,206.05/x
  3. Step 3: Cross multiply
    121,911.75x = 168,241.59 × 68,206.05
  4. Step 4: Simplify right side
    121,911.75x = 11,475,094,299.62
  5. Step 5: Solve for x
    x = 11,475,094,299.62/121,911.75
  6. Step 6: Final answer
    x = 94,126.24

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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.