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Finding the Fourth Proportional to 121,020.80, 181,172.80 and 89,993.60

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Solution

The fourth proportional to 121,020.80, 181,172.80 and 89,993.60 is: 134,723.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,020.80 : 181,172.80 = 89,993.60 : x
  2. Step 2: Convert to fraction form
    121,020.80/181,172.80 = 89,993.60/x
  3. Step 3: Cross multiply
    121,020.80x = 181,172.80 × 89,993.60
  4. Step 4: Simplify right side
    121,020.80x = 16,304,392,494.08
  5. Step 5: Solve for x
    x = 16,304,392,494.08/121,020.80
  6. Step 6: Final answer
    x = 134,723.89

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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.