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Finding the Fourth Proportional to 391,723.20, 587,584.80 and 353,630.40

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Solution

The fourth proportional to 391,723.20, 587,584.80 and 353,630.40 is: 530,445.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,723.20 : 587,584.80 = 353,630.40 : x
  2. Step 2: Convert to fraction form
    391,723.20/587,584.80 = 353,630.40/x
  3. Step 3: Cross multiply
    391,723.20x = 587,584.80 × 353,630.40
  4. Step 4: Simplify right side
    391,723.20x = 207,787,847,857.92
  5. Step 5: Solve for x
    x = 207,787,847,857.92/391,723.20
  6. Step 6: Final answer
    x = 530,445.60

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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.