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Finding the Fourth Proportional to 123,639.36, 170,625.24 and 75,224.64

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Solution

The fourth proportional to 123,639.36, 170,625.24 and 75,224.64 is: 103,811.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,639.36 : 170,625.24 = 75,224.64 : x
  2. Step 2: Convert to fraction form
    123,639.36/170,625.24 = 75,224.64/x
  3. Step 3: Cross multiply
    123,639.36x = 170,625.24 × 75,224.64
  4. Step 4: Simplify right side
    123,639.36x = 12,835,222,253.91
  5. Step 5: Solve for x
    x = 12,835,222,253.91/123,639.36
  6. Step 6: Final answer
    x = 103,811.78

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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.