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Finding the Fourth Proportional to 391,513.80, 587,270.70 and 265,214.55

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Solution

The fourth proportional to 391,513.80, 587,270.70 and 265,214.55 is: 397,821.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,513.80 : 587,270.70 = 265,214.55 : x
  2. Step 2: Convert to fraction form
    391,513.80/587,270.70 = 265,214.55/x
  3. Step 3: Cross multiply
    391,513.80x = 587,270.70 × 265,214.55
  4. Step 4: Simplify right side
    391,513.80x = 155,752,734,428.69
  5. Step 5: Solve for x
    x = 155,752,734,428.69/391,513.80
  6. Step 6: Final answer
    x = 397,821.83

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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.