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Finding the Fourth Proportional to 398,986.50, 550,601.37 and 220,138.50

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Solution

The fourth proportional to 398,986.50, 550,601.37 and 220,138.50 is: 303,791.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,986.50 : 550,601.37 = 220,138.50 : x
  2. Step 2: Convert to fraction form
    398,986.50/550,601.37 = 220,138.50/x
  3. Step 3: Cross multiply
    398,986.50x = 550,601.37 × 220,138.50
  4. Step 4: Simplify right side
    398,986.50x = 121,208,559,689.75
  5. Step 5: Solve for x
    x = 121,208,559,689.75/398,986.50
  6. Step 6: Final answer
    x = 303,791.13

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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.