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Finding the Fourth Proportional to 121,503.70, 182,255.55 and 91,979.20

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Solution

The fourth proportional to 121,503.70, 182,255.55 and 91,979.20 is: 137,968.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,503.70 : 182,255.55 = 91,979.20 : x
  2. Step 2: Convert to fraction form
    121,503.70/182,255.55 = 91,979.20/x
  3. Step 3: Cross multiply
    121,503.70x = 182,255.55 × 91,979.20
  4. Step 4: Simplify right side
    121,503.70x = 16,763,719,684.56
  5. Step 5: Solve for x
    x = 16,763,719,684.56/121,503.70
  6. Step 6: Final answer
    x = 137,968.80

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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.