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Finding the Fourth Proportional to 391,173.20, 587,148.60 and 191,718.80

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Solution

The fourth proportional to 391,173.20, 587,148.60 and 191,718.80 is: 287,768.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,173.20 : 587,148.60 = 191,718.80 : x
  2. Step 2: Convert to fraction form
    391,173.20/587,148.60 = 191,718.80/x
  3. Step 3: Cross multiply
    391,173.20x = 587,148.60 × 191,718.80
  4. Step 4: Simplify right side
    391,173.20x = 112,567,425,013.68
  5. Step 5: Solve for x
    x = 112,567,425,013.68/391,173.20
  6. Step 6: Final answer
    x = 287,768.76

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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.