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Finding the Fourth Proportional to 122,689.50, 169,309.89 and 68,241.30

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Solution

The fourth proportional to 122,689.50, 169,309.89 and 68,241.30 is: 94,172.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,689.50 : 169,309.89 = 68,241.30 : x
  2. Step 2: Convert to fraction form
    122,689.50/169,309.89 = 68,241.30/x
  3. Step 3: Cross multiply
    122,689.50x = 169,309.89 × 68,241.30
  4. Step 4: Simplify right side
    122,689.50x = 11,553,926,996.46
  5. Step 5: Solve for x
    x = 11,553,926,996.46/122,689.50
  6. Step 6: Final answer
    x = 94,172.09

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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.