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Finding the Fourth Proportional to 122,428.50, 168,967.80 and 68,716.45

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Solution

The fourth proportional to 122,428.50, 168,967.80 and 68,716.45 is: 94,837.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,428.50 : 168,967.80 = 68,716.45 : x
  2. Step 2: Convert to fraction form
    122,428.50/168,967.80 = 68,716.45/x
  3. Step 3: Cross multiply
    122,428.50x = 168,967.80 × 68,716.45
  4. Step 4: Simplify right side
    122,428.50x = 11,610,867,380.31
  5. Step 5: Solve for x
    x = 11,610,867,380.31/122,428.50
  6. Step 6: Final answer
    x = 94,837.95

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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.