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Finding the Fourth Proportional to 260,913.34, 391,425.78 and 80,994.80

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Solution

The fourth proportional to 260,913.34, 391,425.78 and 80,994.80 is: 121,509.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,913.34 : 391,425.78 = 80,994.80 : x
  2. Step 2: Convert to fraction form
    260,913.34/391,425.78 = 80,994.80/x
  3. Step 3: Cross multiply
    260,913.34x = 391,425.78 × 80,994.80
  4. Step 4: Simplify right side
    260,913.34x = 31,703,452,765.94
  5. Step 5: Solve for x
    x = 31,703,452,765.94/260,913.34
  6. Step 6: Final answer
    x = 121,509.51

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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.