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Finding the Fourth Proportional to 679,137.84, 936,654.06 and 420,835.37

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Solution

The fourth proportional to 679,137.84, 936,654.06 and 420,835.37 is: 580,408.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,137.84 : 936,654.06 = 420,835.37 : x
  2. Step 2: Convert to fraction form
    679,137.84/936,654.06 = 420,835.37/x
  3. Step 3: Cross multiply
    679,137.84x = 936,654.06 × 420,835.37
  4. Step 4: Simplify right side
    679,137.84x = 394,177,159,149.20
  5. Step 5: Solve for x
    x = 394,177,159,149.20/679,137.84
  6. Step 6: Final answer
    x = 580,408.18

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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.