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Finding the Fourth Proportional to 120,766.70, 166,665.60 and 69,788.80

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Solution

The fourth proportional to 120,766.70, 166,665.60 and 69,788.80 is: 96,312.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,766.70 : 166,665.60 = 69,788.80 : x
  2. Step 2: Convert to fraction form
    120,766.70/166,665.60 = 69,788.80/x
  3. Step 3: Cross multiply
    120,766.70x = 166,665.60 × 69,788.80
  4. Step 4: Simplify right side
    120,766.70x = 11,631,391,808.62
  5. Step 5: Solve for x
    x = 11,631,391,808.62/120,766.70
  6. Step 6: Final answer
    x = 96,312.90

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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.