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Finding the Fourth Proportional to 188,130.20, 281,757.90 and 128,643.80

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Solution

The fourth proportional to 188,130.20, 281,757.90 and 128,643.80 is: 192,666.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    188,130.20 : 281,757.90 = 128,643.80 : x
  2. Step 2: Convert to fraction form
    188,130.20/281,757.90 = 128,643.80/x
  3. Step 3: Cross multiply
    188,130.20x = 281,757.90 × 128,643.80
  4. Step 4: Simplify right side
    188,130.20x = 36,246,406,936.02
  5. Step 5: Solve for x
    x = 36,246,406,936.02/188,130.20
  6. Step 6: Final answer
    x = 192,666.61

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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.