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Finding the Fourth Proportional to 678,772.78, 936,651.81 and 392,311.42

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Solution

The fourth proportional to 678,772.78, 936,651.81 and 392,311.42 is: 541,358.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,772.78 : 936,651.81 = 392,311.42 : x
  2. Step 2: Convert to fraction form
    678,772.78/936,651.81 = 392,311.42/x
  3. Step 3: Cross multiply
    678,772.78x = 936,651.81 × 392,311.42
  4. Step 4: Simplify right side
    678,772.78x = 367,459,201,626.67
  5. Step 5: Solve for x
    x = 367,459,201,626.67/678,772.78
  6. Step 6: Final answer
    x = 541,358.19

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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.