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Finding the Fourth Proportional to 427,808.20, 641,712.30 and 404,998.60

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Solution

The fourth proportional to 427,808.20, 641,712.30 and 404,998.60 is: 607,497.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,808.20 : 641,712.30 = 404,998.60 : x
  2. Step 2: Convert to fraction form
    427,808.20/641,712.30 = 404,998.60/x
  3. Step 3: Cross multiply
    427,808.20x = 641,712.30 × 404,998.60
  4. Step 4: Simplify right side
    427,808.20x = 259,892,583,102.78
  5. Step 5: Solve for x
    x = 259,892,583,102.78/427,808.20
  6. Step 6: Final answer
    x = 607,497.90

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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.