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Finding the Fourth Proportional to 125,940.80, 189,129.90 and 66,891.80

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Solution

The fourth proportional to 125,940.80, 189,129.90 and 66,891.80 is: 100,453.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,940.80 : 189,129.90 = 66,891.80 : x
  2. Step 2: Convert to fraction form
    125,940.80/189,129.90 = 66,891.80/x
  3. Step 3: Cross multiply
    125,940.80x = 189,129.90 × 66,891.80
  4. Step 4: Simplify right side
    125,940.80x = 12,651,239,444.82
  5. Step 5: Solve for x
    x = 12,651,239,444.82/125,940.80
  6. Step 6: Final answer
    x = 100,453.86

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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.