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Finding the Fourth Proportional to 681,876.36, 940,800.42 and 391,486.50

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Solution

The fourth proportional to 681,876.36, 940,800.42 and 391,486.50 is: 540,142.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,876.36 : 940,800.42 = 391,486.50 : x
  2. Step 2: Convert to fraction form
    681,876.36/940,800.42 = 391,486.50/x
  3. Step 3: Cross multiply
    681,876.36x = 940,800.42 × 391,486.50
  4. Step 4: Simplify right side
    681,876.36x = 368,310,663,624.33
  5. Step 5: Solve for x
    x = 368,310,663,624.33/681,876.36
  6. Step 6: Final answer
    x = 540,142.88

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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.