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Finding the Fourth Proportional to 398,911.18, 550,511.30 and 217,633.08

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Solution

The fourth proportional to 398,911.18, 550,511.30 and 217,633.08 is: 300,341.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,911.18 : 550,511.30 = 217,633.08 : x
  2. Step 2: Convert to fraction form
    398,911.18/550,511.30 = 217,633.08/x
  3. Step 3: Cross multiply
    398,911.18x = 550,511.30 × 217,633.08
  4. Step 4: Simplify right side
    398,911.18x = 119,809,469,793.80
  5. Step 5: Solve for x
    x = 119,809,469,793.80/398,911.18
  6. Step 6: Final answer
    x = 300,341.22

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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.