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Finding the Fourth Proportional to 123,728.10, 170,745.22 and 67,139.46

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Solution

The fourth proportional to 123,728.10, 170,745.22 and 67,139.46 is: 92,652.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,728.10 : 170,745.22 = 67,139.46 : x
  2. Step 2: Convert to fraction form
    123,728.10/170,745.22 = 67,139.46/x
  3. Step 3: Cross multiply
    123,728.10x = 170,745.22 × 67,139.46
  4. Step 4: Simplify right side
    123,728.10x = 11,463,741,868.38
  5. Step 5: Solve for x
    x = 11,463,741,868.38/123,728.10
  6. Step 6: Final answer
    x = 92,652.69

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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.