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Finding the Fourth Proportional to 123,728.55, 170,745.85 and 67,139.92

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Solution

The fourth proportional to 123,728.55, 170,745.85 and 67,139.92 is: 92,653.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,728.55 : 170,745.85 = 67,139.92 : x
  2. Step 2: Convert to fraction form
    123,728.55/170,745.85 = 67,139.92/x
  3. Step 3: Cross multiply
    123,728.55x = 170,745.85 × 67,139.92
  4. Step 4: Simplify right side
    123,728.55x = 11,463,862,709.33
  5. Step 5: Solve for x
    x = 11,463,862,709.33/123,728.55
  6. Step 6: Final answer
    x = 92,653.33

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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.