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Finding the Fourth Proportional to 143,287.80, 197,725.50 and 85,939.80

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Solution

The fourth proportional to 143,287.80, 197,725.50 and 85,939.80 is: 118,589.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,287.80 : 197,725.50 = 85,939.80 : x
  2. Step 2: Convert to fraction form
    143,287.80/197,725.50 = 85,939.80/x
  3. Step 3: Cross multiply
    143,287.80x = 197,725.50 × 85,939.80
  4. Step 4: Simplify right side
    143,287.80x = 16,992,489,924.90
  5. Step 5: Solve for x
    x = 16,992,489,924.90/143,287.80
  6. Step 6: Final answer
    x = 118,589.93

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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.