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Finding the Fourth Proportional to 120,728.91, 166,613.66 and 69,743.79

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Solution

The fourth proportional to 120,728.91, 166,613.66 and 69,743.79 is: 96,250.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,728.91 : 166,613.66 = 69,743.79 : x
  2. Step 2: Convert to fraction form
    120,728.91/166,613.66 = 69,743.79/x
  3. Step 3: Cross multiply
    120,728.91x = 166,613.66 × 69,743.79
  4. Step 4: Simplify right side
    120,728.91x = 11,620,267,765.45
  5. Step 5: Solve for x
    x = 11,620,267,765.45/120,728.91
  6. Step 6: Final answer
    x = 96,250.91

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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.