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Finding the Fourth Proportional to 121,772.88, 168,045.52 and 68,057.28

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Solution

The fourth proportional to 121,772.88, 168,045.52 and 68,057.28 is: 93,918.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,772.88 : 168,045.52 = 68,057.28 : x
  2. Step 2: Convert to fraction form
    121,772.88/168,045.52 = 68,057.28/x
  3. Step 3: Cross multiply
    121,772.88x = 168,045.52 × 68,057.28
  4. Step 4: Simplify right side
    121,772.88x = 11,436,721,007.39
  5. Step 5: Solve for x
    x = 11,436,721,007.39/121,772.88
  6. Step 6: Final answer
    x = 93,918.46

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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.