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Finding the Fourth Proportional to 215,949.40, 324,069.90 and 121,179.40

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Solution

The fourth proportional to 215,949.40, 324,069.90 and 121,179.40 is: 181,850.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,949.40 : 324,069.90 = 121,179.40 : x
  2. Step 2: Convert to fraction form
    215,949.40/324,069.90 = 121,179.40/x
  3. Step 3: Cross multiply
    215,949.40x = 324,069.90 × 121,179.40
  4. Step 4: Simplify right side
    215,949.40x = 39,270,596,040.06
  5. Step 5: Solve for x
    x = 39,270,596,040.06/215,949.40
  6. Step 6: Final answer
    x = 181,850.92

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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.