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Finding the Fourth Proportional to 121,420.80, 182,131.20 and 68,932.80

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Solution

The fourth proportional to 121,420.80, 182,131.20 and 68,932.80 is: 103,399.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,420.80 : 182,131.20 = 68,932.80 : x
  2. Step 2: Convert to fraction form
    121,420.80/182,131.20 = 68,932.80/x
  3. Step 3: Cross multiply
    121,420.80x = 182,131.20 × 68,932.80
  4. Step 4: Simplify right side
    121,420.80x = 12,554,813,583.36
  5. Step 5: Solve for x
    x = 12,554,813,583.36/121,420.80
  6. Step 6: Final answer
    x = 103,399.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.