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Finding the Fourth Proportional to 81,918.76, 122,907.76 and 28,618.64

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Solution

The fourth proportional to 81,918.76, 122,907.76 and 28,618.64 is: 42,938.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,918.76 : 122,907.76 = 28,618.64 : x
  2. Step 2: Convert to fraction form
    81,918.76/122,907.76 = 28,618.64/x
  3. Step 3: Cross multiply
    81,918.76x = 122,907.76 × 28,618.64
  4. Step 4: Simplify right side
    81,918.76x = 3,517,452,936.65
  5. Step 5: Solve for x
    x = 3,517,452,936.65/81,918.76
  6. Step 6: Final answer
    x = 42,938.31

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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.