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Finding the Fourth Proportional to 636,399.78, 878,231.50 and 349,938.42

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Solution

The fourth proportional to 636,399.78, 878,231.50 and 349,938.42 is: 482,914.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,399.78 : 878,231.50 = 349,938.42 : x
  2. Step 2: Convert to fraction form
    636,399.78/878,231.50 = 349,938.42/x
  3. Step 3: Cross multiply
    636,399.78x = 878,231.50 × 349,938.42
  4. Step 4: Simplify right side
    636,399.78x = 307,326,943,504.23
  5. Step 5: Solve for x
    x = 307,326,943,504.23/636,399.78
  6. Step 6: Final answer
    x = 482,914.91

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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.