Home / 121,143.20-181,887.60-91,767.20

Finding the Fourth Proportional to 121,143.20, 181,887.60 and 91,767.20

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Solution

The fourth proportional to 121,143.20, 181,887.60 and 91,767.20 is: 137,781.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,143.20 : 181,887.60 = 91,767.20 : x
  2. Step 2: Convert to fraction form
    121,143.20/181,887.60 = 91,767.20/x
  3. Step 3: Cross multiply
    121,143.20x = 181,887.60 × 91,767.20
  4. Step 4: Simplify right side
    121,143.20x = 16,691,315,766.72
  5. Step 5: Solve for x
    x = 16,691,315,766.72/121,143.20
  6. Step 6: Final answer
    x = 137,781.70

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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.