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Finding the Fourth Proportional to 123,489.03, 170,413.92 and 66,900

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Solution

The fourth proportional to 123,489.03, 170,413.92 and 66,900 is: 92,321.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,489.03 : 170,413.92 = 66,900 : x
  2. Step 2: Convert to fraction form
    123,489.03/170,413.92 = 66,900/x
  3. Step 3: Cross multiply
    123,489.03x = 170,413.92 × 66,900
  4. Step 4: Simplify right side
    123,489.03x = 11,400,691,248
  5. Step 5: Solve for x
    x = 11,400,691,248/123,489.03
  6. Step 6: Final answer
    x = 92,321.49

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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.