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Finding the Fourth Proportional to 220,705.80, 331,058.70 and 203,425.80

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Solution

The fourth proportional to 220,705.80, 331,058.70 and 203,425.80 is: 305,138.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,705.80 : 331,058.70 = 203,425.80 : x
  2. Step 2: Convert to fraction form
    220,705.80/331,058.70 = 203,425.80/x
  3. Step 3: Cross multiply
    220,705.80x = 331,058.70 × 203,425.80
  4. Step 4: Simplify right side
    220,705.80x = 67,345,880,894.46
  5. Step 5: Solve for x
    x = 67,345,880,894.46/220,705.80
  6. Step 6: Final answer
    x = 305,138.70

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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.