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Finding the Fourth Proportional to 125,989.20, 188,724.60 and 86,590.80

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Solution

The fourth proportional to 125,989.20, 188,724.60 and 86,590.80 is: 129,708.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,989.20 : 188,724.60 = 86,590.80 : x
  2. Step 2: Convert to fraction form
    125,989.20/188,724.60 = 86,590.80/x
  3. Step 3: Cross multiply
    125,989.20x = 188,724.60 × 86,590.80
  4. Step 4: Simplify right side
    125,989.20x = 16,341,814,093.68
  5. Step 5: Solve for x
    x = 16,341,814,093.68/125,989.20
  6. Step 6: Final answer
    x = 129,708.06

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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.