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Finding the Fourth Proportional to 121,711.08, 167,967.78 and 67,997.28

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Solution

The fourth proportional to 121,711.08, 167,967.78 and 67,997.28 is: 93,839.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,711.08 : 167,967.78 = 67,997.28 : x
  2. Step 2: Convert to fraction form
    121,711.08/167,967.78 = 67,997.28/x
  3. Step 3: Cross multiply
    121,711.08x = 167,967.78 × 67,997.28
  4. Step 4: Simplify right side
    121,711.08x = 11,421,352,167.64
  5. Step 5: Solve for x
    x = 11,421,352,167.64/121,711.08
  6. Step 6: Final answer
    x = 93,839.87

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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.