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Finding the Fourth Proportional to 678,771.78, 936,650.43 and 392,310.42

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Solution

The fourth proportional to 678,771.78, 936,650.43 and 392,310.42 is: 541,356.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,771.78 : 936,650.43 = 392,310.42 : x
  2. Step 2: Convert to fraction form
    678,771.78/936,650.43 = 392,310.42/x
  3. Step 3: Cross multiply
    678,771.78x = 936,650.43 × 392,310.42
  4. Step 4: Simplify right side
    678,771.78x = 367,457,723,586.48
  5. Step 5: Solve for x
    x = 367,457,723,586.48/678,771.78
  6. Step 6: Final answer
    x = 541,356.81

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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.