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Finding the Fourth Proportional to 221,512.50, 305,693.73 and 120,916.98

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Solution

The fourth proportional to 221,512.50, 305,693.73 and 120,916.98 is: 166,868.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,512.50 : 305,693.73 = 120,916.98 : x
  2. Step 2: Convert to fraction form
    221,512.50/305,693.73 = 120,916.98/x
  3. Step 3: Cross multiply
    221,512.50x = 305,693.73 × 120,916.98
  4. Step 4: Simplify right side
    221,512.50x = 36,963,562,636.54
  5. Step 5: Solve for x
    x = 36,963,562,636.54/221,512.50
  6. Step 6: Final answer
    x = 166,868.97

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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.