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Finding the Fourth Proportional to 678,773.78, 936,653.19 and 392,312.42

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Solution

The fourth proportional to 678,773.78, 936,653.19 and 392,312.42 is: 541,359.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,773.78 : 936,653.19 = 392,312.42 : x
  2. Step 2: Convert to fraction form
    678,773.78/936,653.19 = 392,312.42/x
  3. Step 3: Cross multiply
    678,773.78x = 936,653.19 × 392,312.42
  4. Step 4: Simplify right side
    678,773.78x = 367,460,679,669.62
  5. Step 5: Solve for x
    x = 367,460,679,669.62/678,773.78
  6. Step 6: Final answer
    x = 541,359.57

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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.