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Finding the Fourth Proportional to 260,909.83, 391,420.52 and 80,991.30

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Solution

The fourth proportional to 260,909.83, 391,420.52 and 80,991.30 is: 121,504.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,909.83 : 391,420.52 = 80,991.30 : x
  2. Step 2: Convert to fraction form
    260,909.83/391,420.52 = 80,991.30/x
  3. Step 3: Cross multiply
    260,909.83x = 391,420.52 × 80,991.30
  4. Step 4: Simplify right side
    260,909.83x = 31,701,656,761.48
  5. Step 5: Solve for x
    x = 31,701,656,761.48/260,909.83
  6. Step 6: Final answer
    x = 121,504.26

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1.5x scale

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.