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Finding the Fourth Proportional to 391,165.20, 587,136.60 and 191,710.80

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Solution

The fourth proportional to 391,165.20, 587,136.60 and 191,710.80 is: 287,756.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,165.20 : 587,136.60 = 191,710.80 : x
  2. Step 2: Convert to fraction form
    391,165.20/587,136.60 = 191,710.80/x
  3. Step 3: Cross multiply
    391,165.20x = 587,136.60 × 191,710.80
  4. Step 4: Simplify right side
    391,165.20x = 112,560,427,295.28
  5. Step 5: Solve for x
    x = 112,560,427,295.28/391,165.20
  6. Step 6: Final answer
    x = 287,756.75

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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.