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Finding the Fourth Proportional to 125,859.60, 188,789.40 and 121,021.20

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Solution

The fourth proportional to 125,859.60, 188,789.40 and 121,021.20 is: 181,531.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,859.60 : 188,789.40 = 121,021.20 : x
  2. Step 2: Convert to fraction form
    125,859.60/188,789.40 = 121,021.20/x
  3. Step 3: Cross multiply
    125,859.60x = 188,789.40 × 121,021.20
  4. Step 4: Simplify right side
    125,859.60x = 22,847,519,735.28
  5. Step 5: Solve for x
    x = 22,847,519,735.28/125,859.60
  6. Step 6: Final answer
    x = 181,531.80

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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.