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Finding the Fourth Proportional to 120,287.90, 166,014.87 and 69,290.71

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Solution

The fourth proportional to 120,287.90, 166,014.87 and 69,290.71 is: 95,631.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,287.90 : 166,014.87 = 69,290.71 : x
  2. Step 2: Convert to fraction form
    120,287.90/166,014.87 = 69,290.71/x
  3. Step 3: Cross multiply
    120,287.90x = 166,014.87 × 69,290.71
  4. Step 4: Simplify right side
    120,287.90x = 11,503,288,212.86
  5. Step 5: Solve for x
    x = 11,503,288,212.86/120,287.90
  6. Step 6: Final answer
    x = 95,631.30

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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.