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Finding the Fourth Proportional to 391,511.80, 587,267.70 and 265,212.55

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Solution

The fourth proportional to 391,511.80, 587,267.70 and 265,212.55 is: 397,818.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,511.80 : 587,267.70 = 265,212.55 : x
  2. Step 2: Convert to fraction form
    391,511.80/587,267.70 = 265,212.55/x
  3. Step 3: Cross multiply
    391,511.80x = 587,267.70 × 265,212.55
  4. Step 4: Simplify right side
    391,511.80x = 155,750,764,249.64
  5. Step 5: Solve for x
    x = 155,750,764,249.64/391,511.80
  6. Step 6: Final answer
    x = 397,818.83

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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.