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Finding the Fourth Proportional to 618,414.45, 855,129.83 and 490,868.61

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Solution

The fourth proportional to 618,414.45, 855,129.83 and 490,868.61 is: 678,762.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    618,414.45 : 855,129.83 = 490,868.61 : x
  2. Step 2: Convert to fraction form
    618,414.45/855,129.83 = 490,868.61/x
  3. Step 3: Cross multiply
    618,414.45x = 855,129.83 × 490,868.61
  4. Step 4: Simplify right side
    618,414.45x = 419,756,388,883.81
  5. Step 5: Solve for x
    x = 419,756,388,883.81/618,414.45
  6. Step 6: Final answer
    x = 678,762.26

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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.