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Finding the Fourth Proportional to 398,786.28, 550,309.83 and 219,938.28

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Solution

The fourth proportional to 398,786.28, 550,309.83 and 219,938.28 is: 303,506.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,786.28 : 550,309.83 = 219,938.28 : x
  2. Step 2: Convert to fraction form
    398,786.28/550,309.83 = 219,938.28/x
  3. Step 3: Cross multiply
    398,786.28x = 550,309.83 × 219,938.28
  4. Step 4: Simplify right side
    398,786.28x = 121,034,197,477.29
  5. Step 5: Solve for x
    x = 121,034,197,477.29/398,786.28
  6. Step 6: Final answer
    x = 303,506.42

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1.5x scale

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.