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Finding the Fourth Proportional to 67,362.81, 100,978.19 and 57,390.09

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Solution

The fourth proportional to 67,362.81, 100,978.19 and 57,390.09 is: 86,028.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,362.81 : 100,978.19 = 57,390.09 : x
  2. Step 2: Convert to fraction form
    67,362.81/100,978.19 = 57,390.09/x
  3. Step 3: Cross multiply
    67,362.81x = 100,978.19 × 57,390.09
  4. Step 4: Simplify right side
    67,362.81x = 5,795,146,907.25
  5. Step 5: Solve for x
    x = 5,795,146,907.25/67,362.81
  6. Step 6: Final answer
    x = 86,028.88

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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.