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Finding the Fourth Proportional to 681,245.66, 940,118.55 and 394,931.90

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Solution

The fourth proportional to 681,245.66, 940,118.55 and 394,931.90 is: 545,005.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,245.66 : 940,118.55 = 394,931.90 : x
  2. Step 2: Convert to fraction form
    681,245.66/940,118.55 = 394,931.90/x
  3. Step 3: Cross multiply
    681,245.66x = 940,118.55 × 394,931.90
  4. Step 4: Simplify right side
    681,245.66x = 371,282,805,176.75
  5. Step 5: Solve for x
    x = 371,282,805,176.75/681,245.66
  6. Step 6: Final answer
    x = 545,005.75

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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.