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Finding the Fourth Proportional to 120,348.60, 166,087.20 and 66,639.54

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Solution

The fourth proportional to 120,348.60, 166,087.20 and 66,639.54 is: 91,965.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,348.60 : 166,087.20 = 66,639.54 : x
  2. Step 2: Convert to fraction form
    120,348.60/166,087.20 = 66,639.54/x
  3. Step 3: Cross multiply
    120,348.60x = 166,087.20 × 66,639.54
  4. Step 4: Simplify right side
    120,348.60x = 11,067,974,607.89
  5. Step 5: Solve for x
    x = 11,067,974,607.89/120,348.60
  6. Step 6: Final answer
    x = 91,965.96

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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.