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Finding the Fourth Proportional to 391,519.80, 587,279.70 and 265,220.55

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Solution

The fourth proportional to 391,519.80, 587,279.70 and 265,220.55 is: 397,830.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,519.80 : 587,279.70 = 265,220.55 : x
  2. Step 2: Convert to fraction form
    391,519.80/587,279.70 = 265,220.55/x
  3. Step 3: Cross multiply
    391,519.80x = 587,279.70 × 265,220.55
  4. Step 4: Simplify right side
    391,519.80x = 155,758,645,037.84
  5. Step 5: Solve for x
    x = 155,758,645,037.84/391,519.80
  6. Step 6: Final answer
    x = 397,830.83

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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.