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Finding the Fourth Proportional to 112,574.88, 168,920.64 and 81,665.28

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Solution

The fourth proportional to 112,574.88, 168,920.64 and 81,665.28 is: 122,540.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,574.88 : 168,920.64 = 81,665.28 : x
  2. Step 2: Convert to fraction form
    112,574.88/168,920.64 = 81,665.28/x
  3. Step 3: Cross multiply
    112,574.88x = 168,920.64 × 81,665.28
  4. Step 4: Simplify right side
    112,574.88x = 13,794,951,363.38
  5. Step 5: Solve for x
    x = 13,794,951,363.38/112,574.88
  6. Step 6: Final answer
    x = 122,540.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.