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Finding the Fourth Proportional to 121,728.52, 167,986.20 and 68,015.80

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Solution

The fourth proportional to 121,728.52, 167,986.20 and 68,015.80 is: 93,862.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,728.52 : 167,986.20 = 68,015.80 : x
  2. Step 2: Convert to fraction form
    121,728.52/167,986.20 = 68,015.80/x
  3. Step 3: Cross multiply
    121,728.52x = 167,986.20 × 68,015.80
  4. Step 4: Simplify right side
    121,728.52x = 11,425,716,247.00
  5. Step 5: Solve for x
    x = 11,425,716,247.00/121,728.52
  6. Step 6: Final answer
    x = 93,862.28

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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.