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Finding the Fourth Proportional to 189,730.72, 261,825.20 and 103,687.80

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Solution

The fourth proportional to 189,730.72, 261,825.20 and 103,687.80 is: 143,087.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,730.72 : 261,825.20 = 103,687.80 : x
  2. Step 2: Convert to fraction form
    189,730.72/261,825.20 = 103,687.80/x
  3. Step 3: Cross multiply
    189,730.72x = 261,825.20 × 103,687.80
  4. Step 4: Simplify right side
    189,730.72x = 27,148,078,972.56
  5. Step 5: Solve for x
    x = 27,148,078,972.56/189,730.72
  6. Step 6: Final answer
    x = 143,087.42

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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.