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Finding the Fourth Proportional to 123,189, 170,000.82 and 66,600.38

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Solution

The fourth proportional to 123,189, 170,000.82 and 66,600.38 is: 91,908.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,189 : 170,000.82 = 66,600.38 : x
  2. Step 2: Convert to fraction form
    123,189/170,000.82 = 66,600.38/x
  3. Step 3: Cross multiply
    123,189x = 170,000.82 × 66,600.38
  4. Step 4: Simplify right side
    123,189x = 11,322,118,362.31
  5. Step 5: Solve for x
    x = 11,322,118,362.31/123,189
  6. Step 6: Final answer
    x = 91,908.52

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1.5x scale

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.