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Finding the Fourth Proportional to 121,512.96, 181,958.40 and 90,408.96

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Solution

The fourth proportional to 121,512.96, 181,958.40 and 90,408.96 is: 135,382.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,512.96 : 181,958.40 = 90,408.96 : x
  2. Step 2: Convert to fraction form
    121,512.96/181,958.40 = 90,408.96/x
  3. Step 3: Cross multiply
    121,512.96x = 181,958.40 × 90,408.96
  4. Step 4: Simplify right side
    121,512.96x = 16,450,669,707.26
  5. Step 5: Solve for x
    x = 16,450,669,707.26/121,512.96
  6. Step 6: Final answer
    x = 135,382.02

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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.