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Finding the Fourth Proportional to 485,862.45, 728,793.68 and 420,908.55

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Solution

The fourth proportional to 485,862.45, 728,793.68 and 420,908.55 is: 631,362.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,862.45 : 728,793.68 = 420,908.55 : x
  2. Step 2: Convert to fraction form
    485,862.45/728,793.68 = 420,908.55/x
  3. Step 3: Cross multiply
    485,862.45x = 728,793.68 × 420,908.55
  4. Step 4: Simplify right side
    485,862.45x = 306,755,488,993.42
  5. Step 5: Solve for x
    x = 306,755,488,993.42/485,862.45
  6. Step 6: Final answer
    x = 631,362.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.