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Finding the Fourth Proportional to 121,698.36, 167,839.02 and 79,241.40

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Solution

The fourth proportional to 121,698.36, 167,839.02 and 79,241.40 is: 109,284.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,698.36 : 167,839.02 = 79,241.40 : x
  2. Step 2: Convert to fraction form
    121,698.36/167,839.02 = 79,241.40/x
  3. Step 3: Cross multiply
    121,698.36x = 167,839.02 × 79,241.40
  4. Step 4: Simplify right side
    121,698.36x = 13,299,798,919.43
  5. Step 5: Solve for x
    x = 13,299,798,919.43/121,698.36
  6. Step 6: Final answer
    x = 109,284.95

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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.