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Finding the Fourth Proportional to 389,910.40, 584,865.60 and 221,365.60

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Solution

The fourth proportional to 389,910.40, 584,865.60 and 221,365.60 is: 332,048.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,910.40 : 584,865.60 = 221,365.60 : x
  2. Step 2: Convert to fraction form
    389,910.40/584,865.60 = 221,365.60/x
  3. Step 3: Cross multiply
    389,910.40x = 584,865.60 × 221,365.60
  4. Step 4: Simplify right side
    389,910.40x = 129,469,124,463.36
  5. Step 5: Solve for x
    x = 129,469,124,463.36/389,910.40
  6. Step 6: Final answer
    x = 332,048.40

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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.