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Finding the Fourth Proportional to 681,487.76, 940,456.81 and 391,076.20

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Solution

The fourth proportional to 681,487.76, 940,456.81 and 391,076.20 is: 539,687.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,487.76 : 940,456.81 = 391,076.20 : x
  2. Step 2: Convert to fraction form
    681,487.76/940,456.81 = 391,076.20/x
  3. Step 3: Cross multiply
    681,487.76x = 940,456.81 × 391,076.20
  4. Step 4: Simplify right side
    681,487.76x = 367,790,272,190.09
  5. Step 5: Solve for x
    x = 367,790,272,190.09/681,487.76
  6. Step 6: Final answer
    x = 539,687.27

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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.