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Finding the Fourth Proportional to 120,691.29, 166,555.79 and 66,979.78

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Solution

The fourth proportional to 120,691.29, 166,555.79 and 66,979.78 is: 92,433.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,691.29 : 166,555.79 = 66,979.78 : x
  2. Step 2: Convert to fraction form
    120,691.29/166,555.79 = 66,979.78/x
  3. Step 3: Cross multiply
    120,691.29x = 166,555.79 × 66,979.78
  4. Step 4: Simplify right side
    120,691.29x = 11,155,870,171.93
  5. Step 5: Solve for x
    x = 11,155,870,171.93/120,691.29
  6. Step 6: Final answer
    x = 92,433.10

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1.5x scale

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.