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Finding the Fourth Proportional to 361,321.80, 540,945.90 and 221,353.80

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Solution

The fourth proportional to 361,321.80, 540,945.90 and 221,353.80 is: 331,395.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    361,321.80 : 540,945.90 = 221,353.80 : x
  2. Step 2: Convert to fraction form
    361,321.80/540,945.90 = 221,353.80/x
  3. Step 3: Cross multiply
    361,321.80x = 540,945.90 × 221,353.80
  4. Step 4: Simplify right side
    361,321.80x = 119,740,430,559.42
  5. Step 5: Solve for x
    x = 119,740,430,559.42/361,321.80
  6. Step 6: Final answer
    x = 331,395.53

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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.