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Finding the Fourth Proportional to 321,984.20, 482,954.70 and 85,321.80

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Solution

The fourth proportional to 321,984.20, 482,954.70 and 85,321.80 is: 127,976.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,984.20 : 482,954.70 = 85,321.80 : x
  2. Step 2: Convert to fraction form
    321,984.20/482,954.70 = 85,321.80/x
  3. Step 3: Cross multiply
    321,984.20x = 482,954.70 × 85,321.80
  4. Step 4: Simplify right side
    321,984.20x = 41,206,564,322.46
  5. Step 5: Solve for x
    x = 41,206,564,322.46/321,984.20
  6. Step 6: Final answer
    x = 127,976.98

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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.