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Finding the Fourth Proportional to 619,757.28, 855,293.04 and 485,388

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Solution

The fourth proportional to 619,757.28, 855,293.04 and 485,388 is: 669,857.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,757.28 : 855,293.04 = 485,388 : x
  2. Step 2: Convert to fraction form
    619,757.28/855,293.04 = 485,388/x
  3. Step 3: Cross multiply
    619,757.28x = 855,293.04 × 485,388
  4. Step 4: Simplify right side
    619,757.28x = 415,148,978,099.52
  5. Step 5: Solve for x
    x = 415,148,978,099.52/619,757.28
  6. Step 6: Final answer
    x = 669,857.36

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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.