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Finding the Fourth Proportional to 123,456.78, 170,369.46 and 66,867.75

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Solution

The fourth proportional to 123,456.78, 170,369.46 and 66,867.75 is: 92,277.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,456.78 : 170,369.46 = 66,867.75 : x
  2. Step 2: Convert to fraction form
    123,456.78/170,369.46 = 66,867.75/x
  3. Step 3: Cross multiply
    123,456.78x = 170,369.46 × 66,867.75
  4. Step 4: Simplify right side
    123,456.78x = 11,392,222,458.92
  5. Step 5: Solve for x
    x = 11,392,222,458.92/123,456.78
  6. Step 6: Final answer
    x = 92,277.01

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.