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Finding the Fourth Proportional to 123,195.78, 170,009.80 and 66,607.15

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Solution

The fourth proportional to 123,195.78, 170,009.80 and 66,607.15 is: 91,917.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,195.78 : 170,009.80 = 66,607.15 : x
  2. Step 2: Convert to fraction form
    123,195.78/170,009.80 = 66,607.15/x
  3. Step 3: Cross multiply
    123,195.78x = 170,009.80 × 66,607.15
  4. Step 4: Simplify right side
    123,195.78x = 11,323,868,250.07
  5. Step 5: Solve for x
    x = 11,323,868,250.07/123,195.78
  6. Step 6: Final answer
    x = 91,917.66

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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.