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Finding the Fourth Proportional to 121,331.70, 181,803.15 and 76,878.90

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Solution

The fourth proportional to 121,331.70, 181,803.15 and 76,878.90 is: 115,195.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,331.70 : 181,803.15 = 76,878.90 : x
  2. Step 2: Convert to fraction form
    121,331.70/181,803.15 = 76,878.90/x
  3. Step 3: Cross multiply
    121,331.70x = 181,803.15 × 76,878.90
  4. Step 4: Simplify right side
    121,331.70x = 13,976,826,188.54
  5. Step 5: Solve for x
    x = 13,976,826,188.54/121,331.70
  6. Step 6: Final answer
    x = 115,195.17

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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.