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Finding the Fourth Proportional to 121,880.80, 182,821.20 and 108,661.60

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Solution

The fourth proportional to 121,880.80, 182,821.20 and 108,661.60 is: 162,992.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,880.80 : 182,821.20 = 108,661.60 : x
  2. Step 2: Convert to fraction form
    121,880.80/182,821.20 = 108,661.60/x
  3. Step 3: Cross multiply
    121,880.80x = 182,821.20 × 108,661.60
  4. Step 4: Simplify right side
    121,880.80x = 19,865,644,105.92
  5. Step 5: Solve for x
    x = 19,865,644,105.92/121,880.80
  6. Step 6: Final answer
    x = 162,992.40

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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.