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Finding the Fourth Proportional to 391,811.21, 587,717.45 and 107,505.67

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Solution

The fourth proportional to 391,811.21, 587,717.45 and 107,505.67 is: 161,258.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,811.21 : 587,717.45 = 107,505.67 : x
  2. Step 2: Convert to fraction form
    391,811.21/587,717.45 = 107,505.67/x
  3. Step 3: Cross multiply
    391,811.21x = 587,717.45 × 107,505.67
  4. Step 4: Simplify right side
    391,811.21x = 63,182,958,232.94
  5. Step 5: Solve for x
    x = 63,182,958,232.94/391,811.21
  6. Step 6: Final answer
    x = 161,258.68

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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.