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Finding the Fourth Proportional to 123,371.28, 170,074.08 and 80,856

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Solution

The fourth proportional to 123,371.28, 170,074.08 and 80,856 is: 111,464.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,371.28 : 170,074.08 = 80,856 : x
  2. Step 2: Convert to fraction form
    123,371.28/170,074.08 = 80,856/x
  3. Step 3: Cross multiply
    123,371.28x = 170,074.08 × 80,856
  4. Step 4: Simplify right side
    123,371.28x = 13,751,509,812.48
  5. Step 5: Solve for x
    x = 13,751,509,812.48/123,371.28
  6. Step 6: Final answer
    x = 111,464.43

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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.