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Finding the Fourth Proportional to 122,406.78, 168,918.51 and 68,690.42

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Solution

The fourth proportional to 122,406.78, 168,918.51 and 68,690.42 is: 94,791.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,406.78 : 168,918.51 = 68,690.42 : x
  2. Step 2: Convert to fraction form
    122,406.78/168,918.51 = 68,690.42/x
  3. Step 3: Cross multiply
    122,406.78x = 168,918.51 × 68,690.42
  4. Step 4: Simplify right side
    122,406.78x = 11,603,082,553.08
  5. Step 5: Solve for x
    x = 11,603,082,553.08/122,406.78
  6. Step 6: Final answer
    x = 94,791.18

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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.