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Finding the Fourth Proportional to 121,966.88, 168,290.12 and 68,241.47

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Solution

The fourth proportional to 121,966.88, 168,290.12 and 68,241.47 is: 94,159.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,966.88 : 168,290.12 = 68,241.47 : x
  2. Step 2: Convert to fraction form
    121,966.88/168,290.12 = 68,241.47/x
  3. Step 3: Cross multiply
    121,966.88x = 168,290.12 × 68,241.47
  4. Step 4: Simplify right side
    121,966.88x = 11,484,365,175.28
  5. Step 5: Solve for x
    x = 11,484,365,175.28/121,966.88
  6. Step 6: Final answer
    x = 94,159.70

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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.