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Finding the Fourth Proportional to 256,821.20, 385,272.84 and 79,286.48

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Solution

The fourth proportional to 256,821.20, 385,272.84 and 79,286.48 is: 118,942.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,821.20 : 385,272.84 = 79,286.48 : x
  2. Step 2: Convert to fraction form
    256,821.20/385,272.84 = 79,286.48/x
  3. Step 3: Cross multiply
    256,821.20x = 385,272.84 × 79,286.48
  4. Step 4: Simplify right side
    256,821.20x = 30,546,927,323.20
  5. Step 5: Solve for x
    x = 30,546,927,323.20/256,821.20
  6. Step 6: Final answer
    x = 118,942.39

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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.