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Finding the Fourth Proportional to 260,815.80, 391,223.70 and 120,847.80

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Solution

The fourth proportional to 260,815.80, 391,223.70 and 120,847.80 is: 181,271.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,815.80 : 391,223.70 = 120,847.80 : x
  2. Step 2: Convert to fraction form
    260,815.80/391,223.70 = 120,847.80/x
  3. Step 3: Cross multiply
    260,815.80x = 391,223.70 × 120,847.80
  4. Step 4: Simplify right side
    260,815.80x = 47,278,523,452.86
  5. Step 5: Solve for x
    x = 47,278,523,452.86/260,815.80
  6. Step 6: Final answer
    x = 181,271.70

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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.