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Finding the Fourth Proportional to 125,939.80, 189,128.40 and 66,890.80

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Solution

The fourth proportional to 125,939.80, 189,128.40 and 66,890.80 is: 100,452.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,939.80 : 189,128.40 = 66,890.80 : x
  2. Step 2: Convert to fraction form
    125,939.80/189,128.40 = 66,890.80/x
  3. Step 3: Cross multiply
    125,939.80x = 189,128.40 × 66,890.80
  4. Step 4: Simplify right side
    125,939.80x = 12,650,949,978.72
  5. Step 5: Solve for x
    x = 12,650,949,978.72/125,939.80
  6. Step 6: Final answer
    x = 100,452.36

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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.