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Finding the Fourth Proportional to 391,612.70, 587,419.50 and 107,305.67

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Solution

The fourth proportional to 391,612.70, 587,419.50 and 107,305.67 is: 160,958.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,612.70 : 587,419.50 = 107,305.67 : x
  2. Step 2: Convert to fraction form
    391,612.70/587,419.50 = 107,305.67/x
  3. Step 3: Cross multiply
    391,612.70x = 587,419.50 × 107,305.67
  4. Step 4: Simplify right side
    391,612.70x = 63,033,443,018.57
  5. Step 5: Solve for x
    x = 63,033,443,018.57/391,612.70
  6. Step 6: Final answer
    x = 160,958.63

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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.