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Finding the Fourth Proportional to 391,499.40, 587,249.10 and 328,513.80

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Solution

The fourth proportional to 391,499.40, 587,249.10 and 328,513.80 is: 492,770.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,499.40 : 587,249.10 = 328,513.80 : x
  2. Step 2: Convert to fraction form
    391,499.40/587,249.10 = 328,513.80/x
  3. Step 3: Cross multiply
    391,499.40x = 587,249.10 × 328,513.80
  4. Step 4: Simplify right side
    391,499.40x = 192,919,433,387.58
  5. Step 5: Solve for x
    x = 192,919,433,387.58/391,499.40
  6. Step 6: Final answer
    x = 492,770.70

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1.5x scale

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.