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Finding the Fourth Proportional to 391,664.64, 587,390.70 and 107,286.78

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Solution

The fourth proportional to 391,664.64, 587,390.70 and 107,286.78 is: 160,901.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,664.64 : 587,390.70 = 107,286.78 : x
  2. Step 2: Convert to fraction form
    391,664.64/587,390.70 = 107,286.78/x
  3. Step 3: Cross multiply
    391,664.64x = 587,390.70 × 107,286.78
  4. Step 4: Simplify right side
    391,664.64x = 63,019,256,804.95
  5. Step 5: Solve for x
    x = 63,019,256,804.95/391,664.64
  6. Step 6: Final answer
    x = 160,901.06

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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.