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Finding the Fourth Proportional to 121,400.70, 181,906.65 and 76,947.90

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Solution

The fourth proportional to 121,400.70, 181,906.65 and 76,947.90 is: 115,298.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,400.70 : 181,906.65 = 76,947.90 : x
  2. Step 2: Convert to fraction form
    121,400.70/181,906.65 = 76,947.90/x
  3. Step 3: Cross multiply
    121,400.70x = 181,906.65 × 76,947.90
  4. Step 4: Simplify right side
    121,400.70x = 13,997,334,713.54
  5. Step 5: Solve for x
    x = 13,997,334,713.54/121,400.70
  6. Step 6: Final answer
    x = 115,298.63

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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.