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Finding the Fourth Proportional to 391,091.48, 539,713.88 and 255,212.36

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Solution

The fourth proportional to 391,091.48, 539,713.88 and 255,212.36 is: 352,198.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,091.48 : 539,713.88 = 255,212.36 : x
  2. Step 2: Convert to fraction form
    391,091.48/539,713.88 = 255,212.36/x
  3. Step 3: Cross multiply
    391,091.48x = 539,713.88 × 255,212.36
  4. Step 4: Simplify right side
    391,091.48x = 137,741,653,039.56
  5. Step 5: Solve for x
    x = 137,741,653,039.56/391,091.48
  6. Step 6: Final answer
    x = 352,198.04

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1.5x scale

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.