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Finding the Fourth Proportional to 221,032.65, 305,020.90 and 122,921.89

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Solution

The fourth proportional to 221,032.65, 305,020.90 and 122,921.89 is: 169,629.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,032.65 : 305,020.90 = 122,921.89 : x
  2. Step 2: Convert to fraction form
    221,032.65/305,020.90 = 122,921.89/x
  3. Step 3: Cross multiply
    221,032.65x = 305,020.90 × 122,921.89
  4. Step 4: Simplify right side
    221,032.65x = 37,493,745,517.50
  5. Step 5: Solve for x
    x = 37,493,745,517.50/221,032.65
  6. Step 6: Final answer
    x = 169,629.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.