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Finding the Fourth Proportional to 123,611.12, 186,343.16 and 115,371.88

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Solution

The fourth proportional to 123,611.12, 186,343.16 and 115,371.88 is: 173,922.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,611.12 : 186,343.16 = 115,371.88 : x
  2. Step 2: Convert to fraction form
    123,611.12/186,343.16 = 115,371.88/x
  3. Step 3: Cross multiply
    123,611.12x = 186,343.16 × 115,371.88
  4. Step 4: Simplify right side
    123,611.12x = 21,498,760,694.34
  5. Step 5: Solve for x
    x = 21,498,760,694.34/123,611.12
  6. Step 6: Final answer
    x = 173,922.55

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.