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Finding the Fourth Proportional to 391,063.20, 587,307.60 and 342,074.40

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Solution

The fourth proportional to 391,063.20, 587,307.60 and 342,074.40 is: 513,735.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,063.20 : 587,307.60 = 342,074.40 : x
  2. Step 2: Convert to fraction form
    391,063.20/587,307.60 = 342,074.40/x
  3. Step 3: Cross multiply
    391,063.20x = 587,307.60 × 342,074.40
  4. Step 4: Simplify right side
    391,063.20x = 200,902,894,885.44
  5. Step 5: Solve for x
    x = 200,902,894,885.44/391,063.20
  6. Step 6: Final answer
    x = 513,735.11

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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.