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Finding the Fourth Proportional to 619,758.28, 855,294.42 and 485,389

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Solution

The fourth proportional to 619,758.28, 855,294.42 and 485,389 is: 669,858.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,758.28 : 855,294.42 = 485,389 : x
  2. Step 2: Convert to fraction form
    619,758.28/855,294.42 = 485,389/x
  3. Step 3: Cross multiply
    619,758.28x = 855,294.42 × 485,389
  4. Step 4: Simplify right side
    619,758.28x = 415,150,503,229.38
  5. Step 5: Solve for x
    x = 415,150,503,229.38/619,758.28
  6. Step 6: Final answer
    x = 669,858.74

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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.