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Finding the Fourth Proportional to 120,394.89, 166,146.18 and 72,639.02

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Solution

The fourth proportional to 120,394.89, 166,146.18 and 72,639.02 is: 100,242.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,394.89 : 166,146.18 = 72,639.02 : x
  2. Step 2: Convert to fraction form
    120,394.89/166,146.18 = 72,639.02/x
  3. Step 3: Cross multiply
    120,394.89x = 166,146.18 × 72,639.02
  4. Step 4: Simplify right side
    120,394.89x = 12,068,695,691.94
  5. Step 5: Solve for x
    x = 12,068,695,691.94/120,394.89
  6. Step 6: Final answer
    x = 100,242.59

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.