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Finding the Fourth Proportional to 681,563.61, 940,594.78 and 391,172.86

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Solution

The fourth proportional to 681,563.61, 940,594.78 and 391,172.86 is: 539,839.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,563.61 : 940,594.78 = 391,172.86 : x
  2. Step 2: Convert to fraction form
    681,563.61/940,594.78 = 391,172.86/x
  3. Step 3: Cross multiply
    681,563.61x = 940,594.78 × 391,172.86
  4. Step 4: Simplify right side
    681,563.61x = 367,935,150,193.67
  5. Step 5: Solve for x
    x = 367,935,150,193.67/681,563.61
  6. Step 6: Final answer
    x = 539,839.78

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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.