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Finding the Fourth Proportional to 391,367.45, 587,134.85 and 121,489.67

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Solution

The fourth proportional to 391,367.45, 587,134.85 and 121,489.67 is: 182,260.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,367.45 : 587,134.85 = 121,489.67 : x
  2. Step 2: Convert to fraction form
    391,367.45/587,134.85 = 121,489.67/x
  3. Step 3: Cross multiply
    391,367.45x = 587,134.85 × 121,489.67
  4. Step 4: Simplify right side
    391,367.45x = 71,330,821,057.46
  5. Step 5: Solve for x
    x = 71,330,821,057.46/391,367.45
  6. Step 6: Final answer
    x = 182,260.49

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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.