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Finding the Fourth Proportional to 259,705.20, 389,630.70 and 126,589.80

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Solution

The fourth proportional to 259,705.20, 389,630.70 and 126,589.80 is: 189,920.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,705.20 : 389,630.70 = 126,589.80 : x
  2. Step 2: Convert to fraction form
    259,705.20/389,630.70 = 126,589.80/x
  3. Step 3: Cross multiply
    259,705.20x = 389,630.70 × 126,589.80
  4. Step 4: Simplify right side
    259,705.20x = 49,323,272,386.86
  5. Step 5: Solve for x
    x = 49,323,272,386.86/259,705.20
  6. Step 6: Final answer
    x = 189,920.23

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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.