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Finding the Fourth Proportional to 123,894.37, 171,001.44 and 81,456.85

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Solution

The fourth proportional to 123,894.37, 171,001.44 and 81,456.85 is: 112,428.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,894.37 : 171,001.44 = 81,456.85 : x
  2. Step 2: Convert to fraction form
    123,894.37/171,001.44 = 81,456.85/x
  3. Step 3: Cross multiply
    123,894.37x = 171,001.44 × 81,456.85
  4. Step 4: Simplify right side
    123,894.37x = 13,929,238,647.86
  5. Step 5: Solve for x
    x = 13,929,238,647.86/123,894.37
  6. Step 6: Final answer
    x = 112,428.34

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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.