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Finding the Fourth Proportional to 287,399.90, 396,611.96 and 166,611.21

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Solution

The fourth proportional to 287,399.90, 396,611.96 and 166,611.21 is: 229,923.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,399.90 : 396,611.96 = 166,611.21 : x
  2. Step 2: Convert to fraction form
    287,399.90/396,611.96 = 166,611.21/x
  3. Step 3: Cross multiply
    287,399.90x = 396,611.96 × 166,611.21
  4. Step 4: Simplify right side
    287,399.90x = 66,079,998,556.07
  5. Step 5: Solve for x
    x = 66,079,998,556.07/287,399.90
  6. Step 6: Final answer
    x = 229,923.53

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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.