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Finding the Fourth Proportional to 619,763.28, 855,301.32 and 485,394

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Solution

The fourth proportional to 619,763.28, 855,301.32 and 485,394 is: 669,865.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,763.28 : 855,301.32 = 485,394 : x
  2. Step 2: Convert to fraction form
    619,763.28/855,301.32 = 485,394/x
  3. Step 3: Cross multiply
    619,763.28x = 855,301.32 × 485,394
  4. Step 4: Simplify right side
    619,763.28x = 415,158,128,920.08
  5. Step 5: Solve for x
    x = 415,158,128,920.08/619,763.28
  6. Step 6: Final answer
    x = 669,865.64

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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.