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Finding the Fourth Proportional to 188,129.70, 281,757.15 and 128,643.30

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Solution

The fourth proportional to 188,129.70, 281,757.15 and 128,643.30 is: 192,665.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    188,129.70 : 281,757.15 = 128,643.30 : x
  2. Step 2: Convert to fraction form
    188,129.70/281,757.15 = 128,643.30/x
  3. Step 3: Cross multiply
    188,129.70x = 281,757.15 × 128,643.30
  4. Step 4: Simplify right side
    188,129.70x = 36,246,169,574.60
  5. Step 5: Solve for x
    x = 36,246,169,574.60/188,129.70
  6. Step 6: Final answer
    x = 192,665.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.