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Finding the Fourth Proportional to 123,708.78, 170,718.03 and 67,120.02

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Solution

The fourth proportional to 123,708.78, 170,718.03 and 67,120.02 is: 92,625.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,708.78 : 170,718.03 = 67,120.02 : x
  2. Step 2: Convert to fraction form
    123,708.78/170,718.03 = 67,120.02/x
  3. Step 3: Cross multiply
    123,708.78x = 170,718.03 × 67,120.02
  4. Step 4: Simplify right side
    123,708.78x = 11,458,597,587.96
  5. Step 5: Solve for x
    x = 11,458,597,587.96/123,708.78
  6. Step 6: Final answer
    x = 92,625.58

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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.