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Finding the Fourth Proportional to 391,211.46, 539,834.49 and 310,833.54

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Solution

The fourth proportional to 391,211.46, 539,834.49 and 310,833.54 is: 428,920.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,211.46 : 539,834.49 = 310,833.54 : x
  2. Step 2: Convert to fraction form
    391,211.46/539,834.49 = 310,833.54/x
  3. Step 3: Cross multiply
    391,211.46x = 539,834.49 × 310,833.54
  4. Step 4: Simplify right side
    391,211.46x = 167,798,665,540.80
  5. Step 5: Solve for x
    x = 167,798,665,540.80/391,211.46
  6. Step 6: Final answer
    x = 428,920.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.