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Finding the Fourth Proportional to 665,963.11, 998,778.39 and 261,237.58

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Solution

The fourth proportional to 665,963.11, 998,778.39 and 261,237.58 is: 391,791.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,963.11 : 998,778.39 = 261,237.58 : x
  2. Step 2: Convert to fraction form
    665,963.11/998,778.39 = 261,237.58/x
  3. Step 3: Cross multiply
    665,963.11x = 998,778.39 × 261,237.58
  4. Step 4: Simplify right side
    665,963.11x = 260,918,449,559.90
  5. Step 5: Solve for x
    x = 260,918,449,559.90/665,963.11
  6. Step 6: Final answer
    x = 391,791.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.