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Finding the Fourth Proportional to 121,979.20, 182,968.80 and 111,092.80

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Solution

The fourth proportional to 121,979.20, 182,968.80 and 111,092.80 is: 166,639.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,979.20 : 182,968.80 = 111,092.80 : x
  2. Step 2: Convert to fraction form
    121,979.20/182,968.80 = 111,092.80/x
  3. Step 3: Cross multiply
    121,979.20x = 182,968.80 × 111,092.80
  4. Step 4: Simplify right side
    121,979.20x = 20,326,516,304.64
  5. Step 5: Solve for x
    x = 20,326,516,304.64/121,979.20
  6. Step 6: Final answer
    x = 166,639.20

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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.