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Finding the Fourth Proportional to 391,116.71, 539,696.45 and 219,010.75

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Solution

The fourth proportional to 391,116.71, 539,696.45 and 219,010.75 is: 302,209.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,116.71 : 539,696.45 = 219,010.75 : x
  2. Step 2: Convert to fraction form
    391,116.71/539,696.45 = 219,010.75/x
  3. Step 3: Cross multiply
    391,116.71x = 539,696.45 × 219,010.75
  4. Step 4: Simplify right side
    391,116.71x = 118,199,321,842.54
  5. Step 5: Solve for x
    x = 118,199,321,842.54/391,116.71
  6. Step 6: Final answer
    x = 302,209.85

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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.