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Finding the Fourth Proportional to 398,977.50, 550,588.95 and 220,129.50

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Solution

The fourth proportional to 398,977.50, 550,588.95 and 220,129.50 is: 303,778.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,977.50 : 550,588.95 = 220,129.50 : x
  2. Step 2: Convert to fraction form
    398,977.50/550,588.95 = 220,129.50/x
  3. Step 3: Cross multiply
    398,977.50x = 550,588.95 × 220,129.50
  4. Step 4: Simplify right side
    398,977.50x = 121,200,870,269.03
  5. Step 5: Solve for x
    x = 121,200,870,269.03/398,977.50
  6. Step 6: Final answer
    x = 303,778.71

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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.